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|sin(x)|<1/2

|sin(x)|<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:
$$x_{1} = -27.7507351067098$$
$$x_{2} = -47.6474885794452$$
$$x_{3} = 27.7507351067098$$
$$x_{4} = 91.6297857297023$$
$$x_{5} = -31.9395253114962$$
$$x_{6} = 34.0339204138894$$
$$x_{7} = -41.3643032722656$$
$$x_{8} = -5.75958653158129$$
$$x_{9} = 31.9395253114962$$
$$x_{10} = 96.8657734856853$$
$$x_{11} = 40.317105721069$$
$$x_{12} = 44.5058959258554$$
$$x_{13} = -46.6002910282486$$
$$x_{14} = 16.2315620435473$$
$$x_{15} = -18.3259571459405$$
$$x_{16} = -100.007366139275$$
$$x_{17} = 5.75958653158129$$
$$x_{18} = -57.0722665402146$$
$$x_{19} = -90.5825881785057$$
$$x_{20} = -78.0162175641465$$
$$x_{21} = -91.6297857297023$$
$$x_{22} = -60.2138591938044$$
$$x_{23} = -137.706477982353$$
$$x_{24} = -3.66519142918809$$
$$x_{25} = 46.6002910282486$$
$$x_{26} = -34.0339204138894$$
$$x_{27} = 71.733032256967$$
$$x_{28} = -69.6386371545737$$
$$x_{29} = -97.9129710368819$$
$$x_{30} = -12.0427718387609$$
$$x_{31} = 60.2138591938044$$
$$x_{32} = -19.3731546971371$$
$$x_{33} = 69.6386371545737$$
$$x_{34} = 75.9218224617533$$
$$x_{35} = 78.0162175641465$$
$$x_{36} = -38.2227106186758$$
$$x_{37} = -75.9218224617533$$
$$x_{38} = -25.6563400043166$$
$$x_{39} = 3.66519142918809$$
$$x_{40} = -87.4409955249159$$
$$x_{41} = 53.9306738866248$$
$$x_{42} = 38.2227106186758$$
$$x_{43} = -21.4675497995303$$
$$x_{44} = -71.733032256967$$
$$x_{45} = 2.61799387799149$$
$$x_{46} = 12.0427718387609$$
$$x_{47} = 24.60914245312$$
$$x_{48} = -382.750704962356$$
$$x_{49} = 93.7241808320955$$
$$x_{50} = -63.3554518473942$$
$$x_{51} = -9.94837673636768$$
$$x_{52} = -24.60914245312$$
$$x_{53} = -16.2315620435473$$
$$x_{54} = 9.94837673636768$$
$$x_{55} = -62.3082542961976$$
$$x_{56} = 0.523598775598299$$
$$x_{57} = 49.7418836818384$$
$$x_{58} = 18.3259571459405$$
$$x_{59} = 62.3082542961976$$
$$x_{60} = -56.025068989018$$
$$x_{61} = -49.7418836818384$$
$$x_{62} = 47.6474885794452$$
$$x_{63} = 97.9129710368819$$
$$x_{64} = 84.2994028713261$$
$$x_{65} = 56.025068989018$$
$$x_{66} = 90.5825881785057$$
$$x_{67} = 66.497044500984$$
$$x_{68} = -82.2050077689329$$
$$x_{69} = -40.317105721069$$
$$x_{70} = -93.7241808320955$$
$$x_{71} = 68.5914396033772$$
$$x_{72} = -53.9306738866248$$
$$x_{73} = 25.6563400043166$$
$$x_{74} = -85.3466004225227$$
$$x_{75} = 100.007366139275$$
$$x_{76} = 82.2050077689329$$
$$x_{77} = -2.61799387799149$$
$$x_{78} = -43.4586983746588$$
$$x_{79} = 22.5147473507269$$
$$x_{80} = -84.2994028713261$$
$$x_{81} = -65.4498469497874$$
$$x_{82} = -68.5914396033772$$
$$x_{83} = 88.4881930761125$$
$$x_{84} = -66.497044500984$$
$$x_{1} = -27.7507351067098$$
$$x_{2} = -47.6474885794452$$
$$x_{3} = 27.7507351067098$$
$$x_{4} = 91.6297857297023$$
$$x_{5} = -31.9395253114962$$
$$x_{6} = 34.0339204138894$$
$$x_{7} = -41.3643032722656$$
$$x_{8} = -5.75958653158129$$
$$x_{9} = 31.9395253114962$$
$$x_{10} = 96.8657734856853$$
$$x_{11} = 40.317105721069$$
$$x_{12} = 44.5058959258554$$
$$x_{13} = -46.6002910282486$$
$$x_{14} = 16.2315620435473$$
$$x_{15} = -18.3259571459405$$
$$x_{16} = -100.007366139275$$
$$x_{17} = 5.75958653158129$$
$$x_{18} = -57.0722665402146$$
$$x_{19} = -90.5825881785057$$
$$x_{20} = -78.0162175641465$$
$$x_{21} = -91.6297857297023$$
$$x_{22} = -60.2138591938044$$
$$x_{23} = -137.706477982353$$
$$x_{24} = -3.66519142918809$$
$$x_{25} = 46.6002910282486$$
$$x_{26} = -34.0339204138894$$
$$x_{27} = 71.733032256967$$
$$x_{28} = -69.6386371545737$$
$$x_{29} = -97.9129710368819$$
$$x_{30} = -12.0427718387609$$
$$x_{31} = 60.2138591938044$$
$$x_{32} = -19.3731546971371$$
$$x_{33} = 69.6386371545737$$
$$x_{34} = 75.9218224617533$$
$$x_{35} = 78.0162175641465$$
$$x_{36} = -38.2227106186758$$
$$x_{37} = -75.9218224617533$$
$$x_{38} = -25.6563400043166$$
$$x_{39} = 3.66519142918809$$
$$x_{40} = -87.4409955249159$$
$$x_{41} = 53.9306738866248$$
$$x_{42} = 38.2227106186758$$
$$x_{43} = -21.4675497995303$$
$$x_{44} = -71.733032256967$$
$$x_{45} = 2.61799387799149$$
$$x_{46} = 12.0427718387609$$
$$x_{47} = 24.60914245312$$
$$x_{48} = -382.750704962356$$
$$x_{49} = 93.7241808320955$$
$$x_{50} = -63.3554518473942$$
$$x_{51} = -9.94837673636768$$
$$x_{52} = -24.60914245312$$
$$x_{53} = -16.2315620435473$$
$$x_{54} = 9.94837673636768$$
$$x_{55} = -62.3082542961976$$
$$x_{56} = 0.523598775598299$$
$$x_{57} = 49.7418836818384$$
$$x_{58} = 18.3259571459405$$
$$x_{59} = 62.3082542961976$$
$$x_{60} = -56.025068989018$$
$$x_{61} = -49.7418836818384$$
$$x_{62} = 47.6474885794452$$
$$x_{63} = 97.9129710368819$$
$$x_{64} = 84.2994028713261$$
$$x_{65} = 56.025068989018$$
$$x_{66} = 90.5825881785057$$
$$x_{67} = 66.497044500984$$
$$x_{68} = -82.2050077689329$$
$$x_{69} = -40.317105721069$$
$$x_{70} = -93.7241808320955$$
$$x_{71} = 68.5914396033772$$
$$x_{72} = -53.9306738866248$$
$$x_{73} = 25.6563400043166$$
$$x_{74} = -85.3466004225227$$
$$x_{75} = 100.007366139275$$
$$x_{76} = 82.2050077689329$$
$$x_{77} = -2.61799387799149$$
$$x_{78} = -43.4586983746588$$
$$x_{79} = 22.5147473507269$$
$$x_{80} = -84.2994028713261$$
$$x_{81} = -65.4498469497874$$
$$x_{82} = -68.5914396033772$$
$$x_{83} = 88.4881930761125$$
$$x_{84} = -66.497044500984$$
Las raíces dadas
$$x_{48} = -382.750704962356$$
$$x_{23} = -137.706477982353$$
$$x_{16} = -100.007366139275$$
$$x_{29} = -97.9129710368819$$
$$x_{70} = -93.7241808320955$$
$$x_{21} = -91.6297857297023$$
$$x_{19} = -90.5825881785057$$
$$x_{40} = -87.4409955249159$$
$$x_{74} = -85.3466004225227$$
$$x_{80} = -84.2994028713261$$
$$x_{68} = -82.2050077689329$$
$$x_{20} = -78.0162175641465$$
$$x_{37} = -75.9218224617533$$
$$x_{44} = -71.733032256967$$
$$x_{28} = -69.6386371545737$$
$$x_{82} = -68.5914396033772$$
$$x_{84} = -66.497044500984$$
$$x_{81} = -65.4498469497874$$
$$x_{50} = -63.3554518473942$$
$$x_{55} = -62.3082542961976$$
$$x_{22} = -60.2138591938044$$
$$x_{18} = -57.0722665402146$$
$$x_{60} = -56.025068989018$$
$$x_{72} = -53.9306738866248$$
$$x_{61} = -49.7418836818384$$
$$x_{2} = -47.6474885794452$$
$$x_{13} = -46.6002910282486$$
$$x_{78} = -43.4586983746588$$
$$x_{7} = -41.3643032722656$$
$$x_{69} = -40.317105721069$$
$$x_{36} = -38.2227106186758$$
$$x_{26} = -34.0339204138894$$
$$x_{5} = -31.9395253114962$$
$$x_{1} = -27.7507351067098$$
$$x_{38} = -25.6563400043166$$
$$x_{52} = -24.60914245312$$
$$x_{43} = -21.4675497995303$$
$$x_{32} = -19.3731546971371$$
$$x_{15} = -18.3259571459405$$
$$x_{53} = -16.2315620435473$$
$$x_{30} = -12.0427718387609$$
$$x_{51} = -9.94837673636768$$
$$x_{8} = -5.75958653158129$$
$$x_{24} = -3.66519142918809$$
$$x_{77} = -2.61799387799149$$
$$x_{56} = 0.523598775598299$$
$$x_{45} = 2.61799387799149$$
$$x_{39} = 3.66519142918809$$
$$x_{17} = 5.75958653158129$$
$$x_{54} = 9.94837673636768$$
$$x_{46} = 12.0427718387609$$
$$x_{14} = 16.2315620435473$$
$$x_{58} = 18.3259571459405$$
$$x_{79} = 22.5147473507269$$
$$x_{47} = 24.60914245312$$
$$x_{73} = 25.6563400043166$$
$$x_{3} = 27.7507351067098$$
$$x_{9} = 31.9395253114962$$
$$x_{6} = 34.0339204138894$$
$$x_{42} = 38.2227106186758$$
$$x_{11} = 40.317105721069$$
$$x_{12} = 44.5058959258554$$
$$x_{25} = 46.6002910282486$$
$$x_{62} = 47.6474885794452$$
$$x_{57} = 49.7418836818384$$
$$x_{41} = 53.9306738866248$$
$$x_{65} = 56.025068989018$$
$$x_{31} = 60.2138591938044$$
$$x_{59} = 62.3082542961976$$
$$x_{67} = 66.497044500984$$
$$x_{71} = 68.5914396033772$$
$$x_{33} = 69.6386371545737$$
$$x_{27} = 71.733032256967$$
$$x_{34} = 75.9218224617533$$
$$x_{35} = 78.0162175641465$$
$$x_{76} = 82.2050077689329$$
$$x_{64} = 84.2994028713261$$
$$x_{83} = 88.4881930761125$$
$$x_{66} = 90.5825881785057$$
$$x_{4} = 91.6297857297023$$
$$x_{49} = 93.7241808320955$$
$$x_{10} = 96.8657734856853$$
$$x_{63} = 97.9129710368819$$
$$x_{75} = 100.007366139275$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{48}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{48} - \frac{1}{10}$$
=
$$-382.750704962356 + - \frac{1}{10}$$
=
$$-382.850704962356$$
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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-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------ο-------
       x48      x23      x16      x29      x70      x21      x19      x40      x74      x80      x68      x20      x37      x44      x28      x82      x84      x81      x50      x55      x22      x18      x60      x72      x61      x2      x13      x78      x7      x69      x36      x26      x5      x1      x38      x52      x43      x32      x15      x53      x30      x51      x8      x24      x77      x56      x45      x39      x17      x54      x46      x14      x58      x79      x47      x73      x3      x9      x6      x42      x11      x12      x25      x62      x57      x41      x65      x31      x59      x67      x71      x33      x27      x34      x35      x76      x64      x83      x66      x4      x49      x10      x63      x75

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
|sin(x)|<1/2 desigualdades