Se da la desigualdad:
$$\left|{\sin{\left(x \right)}}\right| \leq \frac{\sqrt{3}}{2}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\left|{\sin{\left(x \right)}}\right| = \frac{\sqrt{3}}{2}$$
Resolvemos:
Tenemos la ecuación
$$\left|{\sin{\left(x \right)}}\right| = \frac{\sqrt{3}}{2}$$
cambiamos
$$\left|{\sin{\left(x \right)}}\right| - 1 - \frac{\sqrt{3}}{2} = 0$$
$$\left|{\sin{\left(x \right)}}\right| - 1 - \frac{\sqrt{3}}{2} = 0$$
Sustituimos
$$w = \left|{\sin{\left(x \right)}}\right|$$
Abrimos los paréntesis en el miembro izquierdo de la ecuación
-1 + w - sqrt3/2 = 0
Transportamos los términos libres (sin w)
del miembro izquierdo al derecho, obtenemos:
$$w - \frac{\sqrt{3}}{2} = 1$$
Dividamos ambos miembros de la ecuación en (w - sqrt(3)/2)/w
w = 1 / ((w - sqrt(3)/2)/w)
Obtenemos la respuesta: w = 1 + sqrt(3)/2
hacemos cambio inverso
$$\left|{\sin{\left(x \right)}}\right| = w$$
sustituimos w:
$$x_{1} = -99.4837673636768$$
$$x_{2} = -60.7374579694027$$
$$x_{3} = -5.23598775598299$$
$$x_{4} = 2.0943951023932$$
$$x_{5} = 90.0589894029074$$
$$x_{6} = -93.2005820564972$$
$$x_{7} = -17.8023583703422$$
$$x_{8} = 19.8967534727354$$
$$x_{9} = -39.7935069454707$$
$$x_{10} = 61.7846555205993$$
$$x_{11} = -48.1710873550435$$
$$x_{12} = -10.471975511966$$
$$x_{13} = -70.162235930172$$
$$x_{14} = -79.5870138909414$$
$$x_{15} = -32.4631240870945$$
$$x_{16} = -71.2094334813686$$
$$x_{17} = -86.9173967493176$$
$$x_{18} = 83.7758040957278$$
$$x_{19} = -41.8879020478639$$
$$x_{20} = 30.3687289847013$$
$$x_{21} = -92.1533845053006$$
$$x_{22} = 89.0117918517108$$
$$x_{23} = 99.4837673636768$$
$$x_{24} = 86.9173967493176$$
$$x_{25} = 76.4454212373516$$
$$x_{26} = -19.8967534727354$$
$$x_{27} = 4.18879020478639$$
$$x_{28} = 85.870199198121$$
$$x_{29} = 8.37758040957278$$
$$x_{30} = -77.4926187885482$$
$$x_{31} = 60.7374579694027$$
$$x_{32} = -13.6135681655558$$
$$x_{33} = -49.2182849062401$$
$$x_{34} = 5.23598775598299$$
$$x_{35} = 68.0678408277789$$
$$x_{36} = 11.5191730631626$$
$$x_{37} = 77.4926187885482$$
$$x_{38} = -90.0589894029074$$
$$x_{39} = -85.870199198121$$
$$x_{40} = -57.5958653158129$$
$$x_{41} = -63.8790506229925$$
$$x_{42} = 33.5103216382911$$
$$x_{43} = -24.0855436775217$$
$$x_{44} = 1.0471975511966$$
$$x_{45} = 45.0294947014537$$
$$x_{46} = -16.7551608191456$$
$$x_{47} = 74.3510261349584$$
$$x_{48} = -35.6047167406843$$
$$x_{49} = -83.7758040957278$$
$$x_{50} = 96.342174710087$$
$$x_{51} = -98.4365698124802$$
$$x_{52} = -42.9350995990605$$
$$x_{53} = 71.2094334813686$$
$$x_{54} = -33.5103216382911$$
$$x_{55} = -61.7846555205993$$
$$x_{56} = -26.1799387799149$$
$$x_{57} = -36.6519142918809$$
$$x_{58} = 26.1799387799149$$
$$x_{59} = -80.634211442138$$
$$x_{60} = -38.7463093942741$$
$$x_{61} = 67.0206432765823$$
$$x_{62} = -76.4454212373516$$
$$x_{63} = 70.162235930172$$
$$x_{64} = 10.471975511966$$
$$x_{65} = 16.7551608191456$$
$$x_{66} = 55.5014702134197$$
$$x_{67} = 17.8023583703422$$
$$x_{68} = 48.1710873550435$$
$$x_{69} = 98.4365698124802$$
$$x_{70} = 82.7286065445312$$
$$x_{71} = -11.5191730631626$$
$$x_{72} = 92.1533845053006$$
$$x_{73} = -82.7286065445312$$
$$x_{74} = 52.3598775598299$$
$$x_{75} = 38.7463093942741$$
$$x_{76} = 27.2271363311115$$
$$x_{77} = 41.8879020478639$$
$$x_{78} = -4.18879020478639$$
$$x_{79} = 32.4631240870945$$
$$x_{80} = -55.5014702134197$$
$$x_{81} = -20.943951023932$$
$$x_{82} = -54.4542726622231$$
$$x_{83} = 39.7935069454707$$
$$x_{84} = 23.0383461263252$$
$$x_{85} = -2.0943951023932$$
$$x_{86} = -68.0678408277789$$
$$x_{87} = -64.9262481741891$$
$$x_{88} = 93.2005820564972$$
$$x_{89} = 24.0855436775217$$
$$x_{90} = 46.0766922526503$$
$$x_{91} = 49.2182849062401$$
$$x_{92} = 54.4542726622231$$
$$x_{93} = 63.8790506229925$$
$$x_{94} = -46.0766922526503$$
$$x_{95} = -27.2271363311115$$
$$x_{1} = -99.4837673636768$$
$$x_{2} = -60.7374579694027$$
$$x_{3} = -5.23598775598299$$
$$x_{4} = 2.0943951023932$$
$$x_{5} = 90.0589894029074$$
$$x_{6} = -93.2005820564972$$
$$x_{7} = -17.8023583703422$$
$$x_{8} = 19.8967534727354$$
$$x_{9} = -39.7935069454707$$
$$x_{10} = 61.7846555205993$$
$$x_{11} = -48.1710873550435$$
$$x_{12} = -10.471975511966$$
$$x_{13} = -70.162235930172$$
$$x_{14} = -79.5870138909414$$
$$x_{15} = -32.4631240870945$$
$$x_{16} = -71.2094334813686$$
$$x_{17} = -86.9173967493176$$
$$x_{18} = 83.7758040957278$$
$$x_{19} = -41.8879020478639$$
$$x_{20} = 30.3687289847013$$
$$x_{21} = -92.1533845053006$$
$$x_{22} = 89.0117918517108$$
$$x_{23} = 99.4837673636768$$
$$x_{24} = 86.9173967493176$$
$$x_{25} = 76.4454212373516$$
$$x_{26} = -19.8967534727354$$
$$x_{27} = 4.18879020478639$$
$$x_{28} = 85.870199198121$$
$$x_{29} = 8.37758040957278$$
$$x_{30} = -77.4926187885482$$
$$x_{31} = 60.7374579694027$$
$$x_{32} = -13.6135681655558$$
$$x_{33} = -49.2182849062401$$
$$x_{34} = 5.23598775598299$$
$$x_{35} = 68.0678408277789$$
$$x_{36} = 11.5191730631626$$
$$x_{37} = 77.4926187885482$$
$$x_{38} = -90.0589894029074$$
$$x_{39} = -85.870199198121$$
$$x_{40} = -57.5958653158129$$
$$x_{41} = -63.8790506229925$$
$$x_{42} = 33.5103216382911$$
$$x_{43} = -24.0855436775217$$
$$x_{44} = 1.0471975511966$$
$$x_{45} = 45.0294947014537$$
$$x_{46} = -16.7551608191456$$
$$x_{47} = 74.3510261349584$$
$$x_{48} = -35.6047167406843$$
$$x_{49} = -83.7758040957278$$
$$x_{50} = 96.342174710087$$
$$x_{51} = -98.4365698124802$$
$$x_{52} = -42.9350995990605$$
$$x_{53} = 71.2094334813686$$
$$x_{54} = -33.5103216382911$$
$$x_{55} = -61.7846555205993$$
$$x_{56} = -26.1799387799149$$
$$x_{57} = -36.6519142918809$$
$$x_{58} = 26.1799387799149$$
$$x_{59} = -80.634211442138$$
$$x_{60} = -38.7463093942741$$
$$x_{61} = 67.0206432765823$$
$$x_{62} = -76.4454212373516$$
$$x_{63} = 70.162235930172$$
$$x_{64} = 10.471975511966$$
$$x_{65} = 16.7551608191456$$
$$x_{66} = 55.5014702134197$$
$$x_{67} = 17.8023583703422$$
$$x_{68} = 48.1710873550435$$
$$x_{69} = 98.4365698124802$$
$$x_{70} = 82.7286065445312$$
$$x_{71} = -11.5191730631626$$
$$x_{72} = 92.1533845053006$$
$$x_{73} = -82.7286065445312$$
$$x_{74} = 52.3598775598299$$
$$x_{75} = 38.7463093942741$$
$$x_{76} = 27.2271363311115$$
$$x_{77} = 41.8879020478639$$
$$x_{78} = -4.18879020478639$$
$$x_{79} = 32.4631240870945$$
$$x_{80} = -55.5014702134197$$
$$x_{81} = -20.943951023932$$
$$x_{82} = -54.4542726622231$$
$$x_{83} = 39.7935069454707$$
$$x_{84} = 23.0383461263252$$
$$x_{85} = -2.0943951023932$$
$$x_{86} = -68.0678408277789$$
$$x_{87} = -64.9262481741891$$
$$x_{88} = 93.2005820564972$$
$$x_{89} = 24.0855436775217$$
$$x_{90} = 46.0766922526503$$
$$x_{91} = 49.2182849062401$$
$$x_{92} = 54.4542726622231$$
$$x_{93} = 63.8790506229925$$
$$x_{94} = -46.0766922526503$$
$$x_{95} = -27.2271363311115$$
Las raíces dadas
$$x_{1} = -99.4837673636768$$
$$x_{51} = -98.4365698124802$$
$$x_{6} = -93.2005820564972$$
$$x_{21} = -92.1533845053006$$
$$x_{38} = -90.0589894029074$$
$$x_{17} = -86.9173967493176$$
$$x_{39} = -85.870199198121$$
$$x_{49} = -83.7758040957278$$
$$x_{73} = -82.7286065445312$$
$$x_{59} = -80.634211442138$$
$$x_{14} = -79.5870138909414$$
$$x_{30} = -77.4926187885482$$
$$x_{62} = -76.4454212373516$$
$$x_{16} = -71.2094334813686$$
$$x_{13} = -70.162235930172$$
$$x_{86} = -68.0678408277789$$
$$x_{87} = -64.9262481741891$$
$$x_{41} = -63.8790506229925$$
$$x_{55} = -61.7846555205993$$
$$x_{2} = -60.7374579694027$$
$$x_{40} = -57.5958653158129$$
$$x_{80} = -55.5014702134197$$
$$x_{82} = -54.4542726622231$$
$$x_{33} = -49.2182849062401$$
$$x_{11} = -48.1710873550435$$
$$x_{94} = -46.0766922526503$$
$$x_{52} = -42.9350995990605$$
$$x_{19} = -41.8879020478639$$
$$x_{9} = -39.7935069454707$$
$$x_{60} = -38.7463093942741$$
$$x_{57} = -36.6519142918809$$
$$x_{48} = -35.6047167406843$$
$$x_{54} = -33.5103216382911$$
$$x_{15} = -32.4631240870945$$
$$x_{95} = -27.2271363311115$$
$$x_{56} = -26.1799387799149$$
$$x_{43} = -24.0855436775217$$
$$x_{81} = -20.943951023932$$
$$x_{26} = -19.8967534727354$$
$$x_{7} = -17.8023583703422$$
$$x_{46} = -16.7551608191456$$
$$x_{32} = -13.6135681655558$$
$$x_{71} = -11.5191730631626$$
$$x_{12} = -10.471975511966$$
$$x_{3} = -5.23598775598299$$
$$x_{78} = -4.18879020478639$$
$$x_{85} = -2.0943951023932$$
$$x_{44} = 1.0471975511966$$
$$x_{4} = 2.0943951023932$$
$$x_{27} = 4.18879020478639$$
$$x_{34} = 5.23598775598299$$
$$x_{29} = 8.37758040957278$$
$$x_{64} = 10.471975511966$$
$$x_{36} = 11.5191730631626$$
$$x_{65} = 16.7551608191456$$
$$x_{67} = 17.8023583703422$$
$$x_{8} = 19.8967534727354$$
$$x_{84} = 23.0383461263252$$
$$x_{89} = 24.0855436775217$$
$$x_{58} = 26.1799387799149$$
$$x_{76} = 27.2271363311115$$
$$x_{20} = 30.3687289847013$$
$$x_{79} = 32.4631240870945$$
$$x_{42} = 33.5103216382911$$
$$x_{75} = 38.7463093942741$$
$$x_{83} = 39.7935069454707$$
$$x_{77} = 41.8879020478639$$
$$x_{45} = 45.0294947014537$$
$$x_{90} = 46.0766922526503$$
$$x_{68} = 48.1710873550435$$
$$x_{91} = 49.2182849062401$$
$$x_{74} = 52.3598775598299$$
$$x_{92} = 54.4542726622231$$
$$x_{66} = 55.5014702134197$$
$$x_{31} = 60.7374579694027$$
$$x_{10} = 61.7846555205993$$
$$x_{93} = 63.8790506229925$$
$$x_{61} = 67.0206432765823$$
$$x_{35} = 68.0678408277789$$
$$x_{63} = 70.162235930172$$
$$x_{53} = 71.2094334813686$$
$$x_{47} = 74.3510261349584$$
$$x_{25} = 76.4454212373516$$
$$x_{37} = 77.4926187885482$$
$$x_{70} = 82.7286065445312$$
$$x_{18} = 83.7758040957278$$
$$x_{28} = 85.870199198121$$
$$x_{24} = 86.9173967493176$$
$$x_{22} = 89.0117918517108$$
$$x_{5} = 90.0589894029074$$
$$x_{72} = 92.1533845053006$$
$$x_{88} = 93.2005820564972$$
$$x_{50} = 96.342174710087$$
$$x_{69} = 98.4365698124802$$
$$x_{23} = 99.4837673636768$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} \leq x_{1}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{1} - \frac{1}{10}$$
=
$$-99.4837673636768 + - \frac{1}{10}$$
=
$$-99.5837673636768$$
lo sustituimos en la expresión
$$\left|{\sin{\left(x \right)}}\right| \leq \frac{\sqrt{3}}{2}$$
$$\left|{\sin{\left(-99.5837673636768 \right)}}\right| \leq \frac{\sqrt{3}}{2}$$
___
\/ 3
0.811782175678687 <= -----
2
significa que una de las soluciones de nuestra ecuación será con:
$$x \leq -99.4837673636768$$
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x1 x51 x6 x21 x38 x17 x39 x49 x73 x59 x14 x30 x62 x16 x13 x86 x87 x41 x55 x2 x40 x80 x82 x33 x11 x94 x52 x19 x9 x60 x57 x48 x54 x15 x95 x56 x43 x81 x26 x7 x46 x32 x71 x12 x3 x78 x85 x44 x4 x27 x34 x29 x64 x36 x65 x67 x8 x84 x89 x58 x76 x20 x79 x42 x75 x83 x77 x45 x90 x68 x91 x74 x92 x66 x31 x10 x93 x61 x35 x63 x53 x47 x25 x37 x70 x18 x28 x24 x22 x5 x72 x88 x50 x69 x23
Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x \leq -99.4837673636768$$
$$x \geq -98.4365698124802 \wedge x \leq -93.2005820564972$$
$$x \geq -92.1533845053006 \wedge x \leq -90.0589894029074$$
$$x \geq -86.9173967493176 \wedge x \leq -85.870199198121$$
$$x \geq -83.7758040957278 \wedge x \leq -82.7286065445312$$
$$x \geq -80.634211442138 \wedge x \leq -79.5870138909414$$
$$x \geq -77.4926187885482 \wedge x \leq -76.4454212373516$$
$$x \geq -71.2094334813686 \wedge x \leq -70.162235930172$$
$$x \geq -68.0678408277789 \wedge x \leq -64.9262481741891$$
$$x \geq -63.8790506229925 \wedge x \leq -61.7846555205993$$
$$x \geq -60.7374579694027 \wedge x \leq -57.5958653158129$$
$$x \geq -55.5014702134197 \wedge x \leq -54.4542726622231$$
$$x \geq -49.2182849062401 \wedge x \leq -48.1710873550435$$
$$x \geq -46.0766922526503 \wedge x \leq -42.9350995990605$$
$$x \geq -41.8879020478639 \wedge x \leq -39.7935069454707$$
$$x \geq -38.7463093942741 \wedge x \leq -36.6519142918809$$
$$x \geq -35.6047167406843 \wedge x \leq -33.5103216382911$$
$$x \geq -32.4631240870945 \wedge x \leq -27.2271363311115$$
$$x \geq -26.1799387799149 \wedge x \leq -24.0855436775217$$
$$x \geq -20.943951023932 \wedge x \leq -19.8967534727354$$
$$x \geq -17.8023583703422 \wedge x \leq -16.7551608191456$$
$$x \geq -13.6135681655558 \wedge x \leq -11.5191730631626$$
$$x \geq -10.471975511966 \wedge x \leq -5.23598775598299$$
$$x \geq -4.18879020478639 \wedge x \leq -2.0943951023932$$
$$x \geq 1.0471975511966 \wedge x \leq 2.0943951023932$$
$$x \geq 4.18879020478639 \wedge x \leq 5.23598775598299$$
$$x \geq 8.37758040957278 \wedge x \leq 10.471975511966$$
$$x \geq 11.5191730631626 \wedge x \leq 16.7551608191456$$
$$x \geq 17.8023583703422 \wedge x \leq 19.8967534727354$$
$$x \geq 23.0383461263252 \wedge x \leq 24.0855436775217$$
$$x \geq 26.1799387799149 \wedge x \leq 27.2271363311115$$
$$x \geq 30.3687289847013 \wedge x \leq 32.4631240870945$$
$$x \geq 33.5103216382911 \wedge x \leq 38.7463093942741$$
$$x \geq 39.7935069454707 \wedge x \leq 41.8879020478639$$
$$x \geq 45.0294947014537 \wedge x \leq 46.0766922526503$$
$$x \geq 48.1710873550435 \wedge x \leq 49.2182849062401$$
$$x \geq 52.3598775598299 \wedge x \leq 54.4542726622231$$
$$x \geq 55.5014702134197 \wedge x \leq 60.7374579694027$$
$$x \geq 61.7846555205993 \wedge x \leq 63.8790506229925$$
$$x \geq 67.0206432765823 \wedge x \leq 68.0678408277789$$
$$x \geq 70.162235930172 \wedge x \leq 71.2094334813686$$
$$x \geq 74.3510261349584 \wedge x \leq 76.4454212373516$$
$$x \geq 77.4926187885482 \wedge x \leq 82.7286065445312$$
$$x \geq 83.7758040957278 \wedge x \leq 85.870199198121$$
$$x \geq 86.9173967493176 \wedge x \leq 89.0117918517108$$
$$x \geq 90.0589894029074 \wedge x \leq 92.1533845053006$$
$$x \geq 93.2005820564972 \wedge x \leq 96.342174710087$$
$$x \geq 98.4365698124802 \wedge x \leq 99.4837673636768$$