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|sinx|<1/2

|sinx|<1/2 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
|sin(x)| < 1/2
$$\left|{\sin{\left(x \right)}}\right| < \frac{1}{2}$$
Abs(sin(x)) < 1/2
Solución detallada
Se da la desigualdad:
$$\left|{\sin{\left(x \right)}}\right| < \frac{1}{2}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\left|{\sin{\left(x \right)}}\right| = \frac{1}{2}$$
Resolvemos:
Tenemos la ecuación
$$\left|{\sin{\left(x \right)}}\right| = \frac{1}{2}$$
cambiamos
$$\left|{\sin{\left(x \right)}}\right| - \frac{1}{2} = 0$$
$$\left|{\sin{\left(x \right)}}\right| - \frac{1}{2} = 0$$
Sustituimos
$$w = \left|{\sin{\left(x \right)}}\right|$$
Transportamos los términos libres (sin w)
del miembro izquierdo al derecho, obtenemos:
$$w = \frac{1}{2}$$
Obtenemos la respuesta: w = 1/2
hacemos cambio inverso
$$\left|{\sin{\left(x \right)}}\right| = w$$
sustituimos w:
$$x_{1} = 60.2138591938044$$
$$x_{2} = 18.3259571459405$$
$$x_{3} = 3.66519142918809$$
$$x_{4} = -62.3082542961976$$
$$x_{5} = -60.2138591938044$$
$$x_{6} = -31.9395253114962$$
$$x_{7} = -9.94837673636768$$
$$x_{8} = -78.0162175641465$$
$$x_{9} = -18.3259571459405$$
$$x_{10} = 44.5058959258554$$
$$x_{11} = -68.5914396033772$$
$$x_{12} = 9.94837673636768$$
$$x_{13} = -382.750704962356$$
$$x_{14} = -87.4409955249159$$
$$x_{15} = -97.9129710368819$$
$$x_{16} = -2.61799387799149$$
$$x_{17} = -66.497044500984$$
$$x_{18} = -71.733032256967$$
$$x_{19} = 49.7418836818384$$
$$x_{20} = 66.497044500984$$
$$x_{21} = 0.523598775598299$$
$$x_{22} = -56.025068989018$$
$$x_{23} = 71.733032256967$$
$$x_{24} = 22.5147473507269$$
$$x_{25} = -27.7507351067098$$
$$x_{26} = 84.2994028713261$$
$$x_{27} = -19.3731546971371$$
$$x_{28} = -93.7241808320955$$
$$x_{29} = -21.4675497995303$$
$$x_{30} = 38.2227106186758$$
$$x_{31} = 100.007366139275$$
$$x_{32} = 93.7241808320955$$
$$x_{33} = 16.2315620435473$$
$$x_{34} = -75.9218224617533$$
$$x_{35} = -137.706477982353$$
$$x_{36} = 40.317105721069$$
$$x_{37} = 68.5914396033772$$
$$x_{38} = -85.3466004225227$$
$$x_{39} = 69.6386371545737$$
$$x_{40} = 12.0427718387609$$
$$x_{41} = 78.0162175641465$$
$$x_{42} = 90.5825881785057$$
$$x_{43} = -12.0427718387609$$
$$x_{44} = -91.6297857297023$$
$$x_{45} = 27.7507351067098$$
$$x_{46} = -57.0722665402146$$
$$x_{47} = -34.0339204138894$$
$$x_{48} = -38.2227106186758$$
$$x_{49} = -46.6002910282486$$
$$x_{50} = -69.6386371545737$$
$$x_{51} = -100.007366139275$$
$$x_{52} = 53.9306738866248$$
$$x_{53} = -82.2050077689329$$
$$x_{54} = -84.2994028713261$$
$$x_{55} = -24.60914245312$$
$$x_{56} = -16.2315620435473$$
$$x_{57} = -53.9306738866248$$
$$x_{58} = 96.8657734856853$$
$$x_{59} = -3.66519142918809$$
$$x_{60} = 75.9218224617533$$
$$x_{61} = 34.0339204138894$$
$$x_{62} = -25.6563400043166$$
$$x_{63} = 31.9395253114962$$
$$x_{64} = 47.6474885794452$$
$$x_{65} = -5.75958653158129$$
$$x_{66} = 24.60914245312$$
$$x_{67} = -65.4498469497874$$
$$x_{68} = -41.3643032722656$$
$$x_{69} = -63.3554518473942$$
$$x_{70} = 56.025068989018$$
$$x_{71} = 91.6297857297023$$
$$x_{72} = -47.6474885794452$$
$$x_{73} = 88.4881930761125$$
$$x_{74} = 46.6002910282486$$
$$x_{75} = 2.61799387799149$$
$$x_{76} = 82.2050077689329$$
$$x_{77} = 25.6563400043166$$
$$x_{78} = -43.4586983746588$$
$$x_{79} = -40.317105721069$$
$$x_{80} = -49.7418836818384$$
$$x_{81} = 5.75958653158129$$
$$x_{82} = -90.5825881785057$$
$$x_{83} = 62.3082542961976$$
$$x_{84} = 97.9129710368819$$
$$x_{1} = 60.2138591938044$$
$$x_{2} = 18.3259571459405$$
$$x_{3} = 3.66519142918809$$
$$x_{4} = -62.3082542961976$$
$$x_{5} = -60.2138591938044$$
$$x_{6} = -31.9395253114962$$
$$x_{7} = -9.94837673636768$$
$$x_{8} = -78.0162175641465$$
$$x_{9} = -18.3259571459405$$
$$x_{10} = 44.5058959258554$$
$$x_{11} = -68.5914396033772$$
$$x_{12} = 9.94837673636768$$
$$x_{13} = -382.750704962356$$
$$x_{14} = -87.4409955249159$$
$$x_{15} = -97.9129710368819$$
$$x_{16} = -2.61799387799149$$
$$x_{17} = -66.497044500984$$
$$x_{18} = -71.733032256967$$
$$x_{19} = 49.7418836818384$$
$$x_{20} = 66.497044500984$$
$$x_{21} = 0.523598775598299$$
$$x_{22} = -56.025068989018$$
$$x_{23} = 71.733032256967$$
$$x_{24} = 22.5147473507269$$
$$x_{25} = -27.7507351067098$$
$$x_{26} = 84.2994028713261$$
$$x_{27} = -19.3731546971371$$
$$x_{28} = -93.7241808320955$$
$$x_{29} = -21.4675497995303$$
$$x_{30} = 38.2227106186758$$
$$x_{31} = 100.007366139275$$
$$x_{32} = 93.7241808320955$$
$$x_{33} = 16.2315620435473$$
$$x_{34} = -75.9218224617533$$
$$x_{35} = -137.706477982353$$
$$x_{36} = 40.317105721069$$
$$x_{37} = 68.5914396033772$$
$$x_{38} = -85.3466004225227$$
$$x_{39} = 69.6386371545737$$
$$x_{40} = 12.0427718387609$$
$$x_{41} = 78.0162175641465$$
$$x_{42} = 90.5825881785057$$
$$x_{43} = -12.0427718387609$$
$$x_{44} = -91.6297857297023$$
$$x_{45} = 27.7507351067098$$
$$x_{46} = -57.0722665402146$$
$$x_{47} = -34.0339204138894$$
$$x_{48} = -38.2227106186758$$
$$x_{49} = -46.6002910282486$$
$$x_{50} = -69.6386371545737$$
$$x_{51} = -100.007366139275$$
$$x_{52} = 53.9306738866248$$
$$x_{53} = -82.2050077689329$$
$$x_{54} = -84.2994028713261$$
$$x_{55} = -24.60914245312$$
$$x_{56} = -16.2315620435473$$
$$x_{57} = -53.9306738866248$$
$$x_{58} = 96.8657734856853$$
$$x_{59} = -3.66519142918809$$
$$x_{60} = 75.9218224617533$$
$$x_{61} = 34.0339204138894$$
$$x_{62} = -25.6563400043166$$
$$x_{63} = 31.9395253114962$$
$$x_{64} = 47.6474885794452$$
$$x_{65} = -5.75958653158129$$
$$x_{66} = 24.60914245312$$
$$x_{67} = -65.4498469497874$$
$$x_{68} = -41.3643032722656$$
$$x_{69} = -63.3554518473942$$
$$x_{70} = 56.025068989018$$
$$x_{71} = 91.6297857297023$$
$$x_{72} = -47.6474885794452$$
$$x_{73} = 88.4881930761125$$
$$x_{74} = 46.6002910282486$$
$$x_{75} = 2.61799387799149$$
$$x_{76} = 82.2050077689329$$
$$x_{77} = 25.6563400043166$$
$$x_{78} = -43.4586983746588$$
$$x_{79} = -40.317105721069$$
$$x_{80} = -49.7418836818384$$
$$x_{81} = 5.75958653158129$$
$$x_{82} = -90.5825881785057$$
$$x_{83} = 62.3082542961976$$
$$x_{84} = 97.9129710368819$$
Las raíces dadas
$$x_{13} = -382.750704962356$$
$$x_{35} = -137.706477982353$$
$$x_{51} = -100.007366139275$$
$$x_{15} = -97.9129710368819$$
$$x_{28} = -93.7241808320955$$
$$x_{44} = -91.6297857297023$$
$$x_{82} = -90.5825881785057$$
$$x_{14} = -87.4409955249159$$
$$x_{38} = -85.3466004225227$$
$$x_{54} = -84.2994028713261$$
$$x_{53} = -82.2050077689329$$
$$x_{8} = -78.0162175641465$$
$$x_{34} = -75.9218224617533$$
$$x_{18} = -71.733032256967$$
$$x_{50} = -69.6386371545737$$
$$x_{11} = -68.5914396033772$$
$$x_{17} = -66.497044500984$$
$$x_{67} = -65.4498469497874$$
$$x_{69} = -63.3554518473942$$
$$x_{4} = -62.3082542961976$$
$$x_{5} = -60.2138591938044$$
$$x_{46} = -57.0722665402146$$
$$x_{22} = -56.025068989018$$
$$x_{57} = -53.9306738866248$$
$$x_{80} = -49.7418836818384$$
$$x_{72} = -47.6474885794452$$
$$x_{49} = -46.6002910282486$$
$$x_{78} = -43.4586983746588$$
$$x_{68} = -41.3643032722656$$
$$x_{79} = -40.317105721069$$
$$x_{48} = -38.2227106186758$$
$$x_{47} = -34.0339204138894$$
$$x_{6} = -31.9395253114962$$
$$x_{25} = -27.7507351067098$$
$$x_{62} = -25.6563400043166$$
$$x_{55} = -24.60914245312$$
$$x_{29} = -21.4675497995303$$
$$x_{27} = -19.3731546971371$$
$$x_{9} = -18.3259571459405$$
$$x_{56} = -16.2315620435473$$
$$x_{43} = -12.0427718387609$$
$$x_{7} = -9.94837673636768$$
$$x_{65} = -5.75958653158129$$
$$x_{59} = -3.66519142918809$$
$$x_{16} = -2.61799387799149$$
$$x_{21} = 0.523598775598299$$
$$x_{75} = 2.61799387799149$$
$$x_{3} = 3.66519142918809$$
$$x_{81} = 5.75958653158129$$
$$x_{12} = 9.94837673636768$$
$$x_{40} = 12.0427718387609$$
$$x_{33} = 16.2315620435473$$
$$x_{2} = 18.3259571459405$$
$$x_{24} = 22.5147473507269$$
$$x_{66} = 24.60914245312$$
$$x_{77} = 25.6563400043166$$
$$x_{45} = 27.7507351067098$$
$$x_{63} = 31.9395253114962$$
$$x_{61} = 34.0339204138894$$
$$x_{30} = 38.2227106186758$$
$$x_{36} = 40.317105721069$$
$$x_{10} = 44.5058959258554$$
$$x_{74} = 46.6002910282486$$
$$x_{64} = 47.6474885794452$$
$$x_{19} = 49.7418836818384$$
$$x_{52} = 53.9306738866248$$
$$x_{70} = 56.025068989018$$
$$x_{1} = 60.2138591938044$$
$$x_{83} = 62.3082542961976$$
$$x_{20} = 66.497044500984$$
$$x_{37} = 68.5914396033772$$
$$x_{39} = 69.6386371545737$$
$$x_{23} = 71.733032256967$$
$$x_{60} = 75.9218224617533$$
$$x_{41} = 78.0162175641465$$
$$x_{76} = 82.2050077689329$$
$$x_{26} = 84.2994028713261$$
$$x_{73} = 88.4881930761125$$
$$x_{42} = 90.5825881785057$$
$$x_{71} = 91.6297857297023$$
$$x_{32} = 93.7241808320955$$
$$x_{58} = 96.8657734856853$$
$$x_{84} = 97.9129710368819$$
$$x_{31} = 100.007366139275$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{13}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{13} - \frac{1}{10}$$
=
$$-382.750704962356 + - \frac{1}{10}$$
=
$$-382.850704962356$$
lo sustituimos en la expresión
$$\left|{\sin{\left(x \right)}}\right| < \frac{1}{2}$$
$$\left|{\sin{\left(-382.850704962356 \right)}}\right| < \frac{1}{2}$$
0.411043807676265 < 1/2

significa que una de las soluciones de nuestra ecuación será con:
$$x < -382.750704962356$$
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       x13      x35      x51      x15      x28      x44      x82      x14      x38      x54      x53      x8      x34      x18      x50      x11      x17      x67      x69      x4      x5      x46      x22      x57      x80      x72      x49      x78      x68      x79      x48      x47      x6      x25      x62      x55      x29      x27      x9      x56      x43      x7      x65      x59      x16      x21      x75      x3      x81      x12      x40      x33      x2      x24      x66      x77      x45      x63      x61      x30      x36      x10      x74      x64      x19      x52      x70      x1      x83      x20      x37      x39      x23      x60      x41      x76      x26      x73      x42      x71      x32      x58      x84      x31

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x < -382.750704962356$$
$$x > -137.706477982353 \wedge x < -100.007366139275$$
$$x > -97.9129710368819 \wedge x < -93.7241808320955$$
$$x > -91.6297857297023 \wedge x < -90.5825881785057$$
$$x > -87.4409955249159 \wedge x < -85.3466004225227$$
$$x > -84.2994028713261 \wedge x < -82.2050077689329$$
$$x > -78.0162175641465 \wedge x < -75.9218224617533$$
$$x > -71.733032256967 \wedge x < -69.6386371545737$$
$$x > -68.5914396033772 \wedge x < -66.497044500984$$
$$x > -65.4498469497874 \wedge x < -63.3554518473942$$
$$x > -62.3082542961976 \wedge x < -60.2138591938044$$
$$x > -57.0722665402146 \wedge x < -56.025068989018$$
$$x > -53.9306738866248 \wedge x < -49.7418836818384$$
$$x > -47.6474885794452 \wedge x < -46.6002910282486$$
$$x > -43.4586983746588 \wedge x < -41.3643032722656$$
$$x > -40.317105721069 \wedge x < -38.2227106186758$$
$$x > -34.0339204138894 \wedge x < -31.9395253114962$$
$$x > -27.7507351067098 \wedge x < -25.6563400043166$$
$$x > -24.60914245312 \wedge x < -21.4675497995303$$
$$x > -19.3731546971371 \wedge x < -18.3259571459405$$
$$x > -16.2315620435473 \wedge x < -12.0427718387609$$
$$x > -9.94837673636768 \wedge x < -5.75958653158129$$
$$x > -3.66519142918809 \wedge x < -2.61799387799149$$
$$x > 0.523598775598299 \wedge x < 2.61799387799149$$
$$x > 3.66519142918809 \wedge x < 5.75958653158129$$
$$x > 9.94837673636768 \wedge x < 12.0427718387609$$
$$x > 16.2315620435473 \wedge x < 18.3259571459405$$
$$x > 22.5147473507269 \wedge x < 24.60914245312$$
$$x > 25.6563400043166 \wedge x < 27.7507351067098$$
$$x > 31.9395253114962 \wedge x < 34.0339204138894$$
$$x > 38.2227106186758 \wedge x < 40.317105721069$$
$$x > 44.5058959258554 \wedge x < 46.6002910282486$$
$$x > 47.6474885794452 \wedge x < 49.7418836818384$$
$$x > 53.9306738866248 \wedge x < 56.025068989018$$
$$x > 60.2138591938044 \wedge x < 62.3082542961976$$
$$x > 66.497044500984 \wedge x < 68.5914396033772$$
$$x > 69.6386371545737 \wedge x < 71.733032256967$$
$$x > 75.9218224617533 \wedge x < 78.0162175641465$$
$$x > 82.2050077689329 \wedge x < 84.2994028713261$$
$$x > 88.4881930761125 \wedge x < 90.5825881785057$$
$$x > 91.6297857297023 \wedge x < 93.7241808320955$$
$$x > 96.8657734856853 \wedge x < 97.9129710368819$$
$$x > 100.007366139275$$
Solución de la desigualdad en el gráfico
Gráfico
|sinx|<1/2 desigualdades