Sr Examen

|sinx|+|cosx|>1 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
|sin(x)| + |cos(x)| > 1
$$\left|{\sin{\left(x \right)}}\right| + \left|{\cos{\left(x \right)}}\right| > 1$$
Abs(sin(x)) + Abs(cos(x)) > 1
Solución detallada
Se da la desigualdad:
$$\left|{\sin{\left(x \right)}}\right| + \left|{\cos{\left(x \right)}}\right| > 1$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\left|{\sin{\left(x \right)}}\right| + \left|{\cos{\left(x \right)}}\right| = 1$$
Resolvemos:
$$x_{1} = -59.6902604182061$$
$$x_{2} = 87.9645943005142$$
$$x_{3} = 73.8274273593601$$
$$x_{4} = -37.6991118430775$$
$$x_{5} = 95.8185759344887$$
$$x_{6} = -81.6814089933346$$
$$x_{7} = -21.9911485751286$$
$$x_{8} = -58.1194640914112$$
$$x_{9} = -23.5619449019235$$
$$x_{10} = -15.707963267949$$
$$x_{11} = -89.5353906273091$$
$$x_{12} = 26.7035375555132$$
$$x_{13} = -17.2787595947439$$
$$x_{14} = -87.9645943005142$$
$$x_{15} = 4393.51732604533$$
$$x_{16} = 72.2566310325652$$
$$x_{17} = 42.4115008234622$$
$$x_{18} = -7.85398163397448$$
$$x_{19} = -14.1371669411541$$
$$x_{20} = -94.2477796076938$$
$$x_{21} = 6.28318530717959$$
$$x_{22} = -1.5707963267949$$
$$x_{23} = 1.5707963267949$$
$$x_{24} = 29.845130209103$$
$$x_{25} = -51.8362787842316$$
$$x_{26} = -29.845130209103$$
$$x_{27} = 65.9734457253857$$
$$x_{28} = 0$$
$$x_{29} = -50.2654824574367$$
$$x_{30} = -18.8495559215388$$
$$x_{31} = -48.6946861306418$$
$$x_{32} = -73.8274273593601$$
$$x_{33} = -43.9822971502571$$
$$x_{34} = 20.4203522483337$$
$$x_{35} = 51.8362787842316$$
$$x_{36} = 43.9822971502571$$
$$x_{37} = -67.5442420521806$$
$$x_{38} = -65.9734457253857$$
$$x_{39} = -45.553093477052$$
$$x_{40} = -28.2743338823081$$
$$x_{41} = -95.8185759344887$$
$$x_{42} = -32.9867228626928$$
$$x_{43} = -72.2566310325652$$
$$x_{44} = 28.2743338823081$$
$$x_{45} = -36.1283155162826$$
$$x_{46} = 21.9911485751286$$
$$x_{47} = 7.85398163397448$$
$$x_{48} = 50.2654824574367$$
$$x_{49} = -80.1106126665397$$
$$x_{50} = 94.2477796076938$$
$$x_{51} = 86.3937979737193$$
$$x_{52} = 64.4026493985908$$
$$x_{1} = -59.6902604182061$$
$$x_{2} = 87.9645943005142$$
$$x_{3} = 73.8274273593601$$
$$x_{4} = -37.6991118430775$$
$$x_{5} = 95.8185759344887$$
$$x_{6} = -81.6814089933346$$
$$x_{7} = -21.9911485751286$$
$$x_{8} = -58.1194640914112$$
$$x_{9} = -23.5619449019235$$
$$x_{10} = -15.707963267949$$
$$x_{11} = -89.5353906273091$$
$$x_{12} = 26.7035375555132$$
$$x_{13} = -17.2787595947439$$
$$x_{14} = -87.9645943005142$$
$$x_{15} = 4393.51732604533$$
$$x_{16} = 72.2566310325652$$
$$x_{17} = 42.4115008234622$$
$$x_{18} = -7.85398163397448$$
$$x_{19} = -14.1371669411541$$
$$x_{20} = -94.2477796076938$$
$$x_{21} = 6.28318530717959$$
$$x_{22} = -1.5707963267949$$
$$x_{23} = 1.5707963267949$$
$$x_{24} = 29.845130209103$$
$$x_{25} = -51.8362787842316$$
$$x_{26} = -29.845130209103$$
$$x_{27} = 65.9734457253857$$
$$x_{28} = 0$$
$$x_{29} = -50.2654824574367$$
$$x_{30} = -18.8495559215388$$
$$x_{31} = -48.6946861306418$$
$$x_{32} = -73.8274273593601$$
$$x_{33} = -43.9822971502571$$
$$x_{34} = 20.4203522483337$$
$$x_{35} = 51.8362787842316$$
$$x_{36} = 43.9822971502571$$
$$x_{37} = -67.5442420521806$$
$$x_{38} = -65.9734457253857$$
$$x_{39} = -45.553093477052$$
$$x_{40} = -28.2743338823081$$
$$x_{41} = -95.8185759344887$$
$$x_{42} = -32.9867228626928$$
$$x_{43} = -72.2566310325652$$
$$x_{44} = 28.2743338823081$$
$$x_{45} = -36.1283155162826$$
$$x_{46} = 21.9911485751286$$
$$x_{47} = 7.85398163397448$$
$$x_{48} = 50.2654824574367$$
$$x_{49} = -80.1106126665397$$
$$x_{50} = 94.2477796076938$$
$$x_{51} = 86.3937979737193$$
$$x_{52} = 64.4026493985908$$
Las raíces dadas
$$x_{41} = -95.8185759344887$$
$$x_{20} = -94.2477796076938$$
$$x_{11} = -89.5353906273091$$
$$x_{14} = -87.9645943005142$$
$$x_{6} = -81.6814089933346$$
$$x_{49} = -80.1106126665397$$
$$x_{32} = -73.8274273593601$$
$$x_{43} = -72.2566310325652$$
$$x_{37} = -67.5442420521806$$
$$x_{38} = -65.9734457253857$$
$$x_{1} = -59.6902604182061$$
$$x_{8} = -58.1194640914112$$
$$x_{25} = -51.8362787842316$$
$$x_{29} = -50.2654824574367$$
$$x_{31} = -48.6946861306418$$
$$x_{39} = -45.553093477052$$
$$x_{33} = -43.9822971502571$$
$$x_{4} = -37.6991118430775$$
$$x_{45} = -36.1283155162826$$
$$x_{42} = -32.9867228626928$$
$$x_{26} = -29.845130209103$$
$$x_{40} = -28.2743338823081$$
$$x_{9} = -23.5619449019235$$
$$x_{7} = -21.9911485751286$$
$$x_{30} = -18.8495559215388$$
$$x_{13} = -17.2787595947439$$
$$x_{10} = -15.707963267949$$
$$x_{19} = -14.1371669411541$$
$$x_{18} = -7.85398163397448$$
$$x_{22} = -1.5707963267949$$
$$x_{28} = 0$$
$$x_{23} = 1.5707963267949$$
$$x_{21} = 6.28318530717959$$
$$x_{47} = 7.85398163397448$$
$$x_{34} = 20.4203522483337$$
$$x_{46} = 21.9911485751286$$
$$x_{12} = 26.7035375555132$$
$$x_{44} = 28.2743338823081$$
$$x_{24} = 29.845130209103$$
$$x_{17} = 42.4115008234622$$
$$x_{36} = 43.9822971502571$$
$$x_{48} = 50.2654824574367$$
$$x_{35} = 51.8362787842316$$
$$x_{52} = 64.4026493985908$$
$$x_{27} = 65.9734457253857$$
$$x_{16} = 72.2566310325652$$
$$x_{3} = 73.8274273593601$$
$$x_{51} = 86.3937979737193$$
$$x_{2} = 87.9645943005142$$
$$x_{50} = 94.2477796076938$$
$$x_{5} = 95.8185759344887$$
$$x_{15} = 4393.51732604533$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{41}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{41} - \frac{1}{10}$$
=
$$-95.8185759344887 + - \frac{1}{10}$$
=
$$-95.9185759344887$$
lo sustituimos en la expresión
$$\left|{\sin{\left(x \right)}}\right| + \left|{\cos{\left(x \right)}}\right| > 1$$
$$\left|{\cos{\left(-95.9185759344887 \right)}}\right| + \left|{\sin{\left(-95.9185759344887 \right)}}\right| > 1$$
1.09483758192485 > 1

significa que una de las soluciones de nuestra ecuación será con:
$$x < -95.8185759344887$$
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       x41      x20      x11      x14      x6      x49      x32      x43      x37      x38      x1      x8      x25      x29      x31      x39      x33      x4      x45      x42      x26      x40      x9      x7      x30      x13      x10      x19      x18      x22      x28      x23      x21      x47      x34      x46      x12      x44      x24      x17      x36      x48      x35      x52      x27      x16      x3      x51      x2      x50      x5      x15

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x < -95.8185759344887$$
$$x > -94.2477796076938 \wedge x < -89.5353906273091$$
$$x > -87.9645943005142 \wedge x < -81.6814089933346$$
$$x > -80.1106126665397 \wedge x < -73.8274273593601$$
$$x > -72.2566310325652 \wedge x < -67.5442420521806$$
$$x > -65.9734457253857 \wedge x < -59.6902604182061$$
$$x > -58.1194640914112 \wedge x < -51.8362787842316$$
$$x > -50.2654824574367 \wedge x < -48.6946861306418$$
$$x > -45.553093477052 \wedge x < -43.9822971502571$$
$$x > -37.6991118430775 \wedge x < -36.1283155162826$$
$$x > -32.9867228626928 \wedge x < -29.845130209103$$
$$x > -28.2743338823081 \wedge x < -23.5619449019235$$
$$x > -21.9911485751286 \wedge x < -18.8495559215388$$
$$x > -17.2787595947439 \wedge x < -15.707963267949$$
$$x > -14.1371669411541 \wedge x < -7.85398163397448$$
$$x > -1.5707963267949 \wedge x < 0$$
$$x > 1.5707963267949 \wedge x < 6.28318530717959$$
$$x > 7.85398163397448 \wedge x < 20.4203522483337$$
$$x > 21.9911485751286 \wedge x < 26.7035375555132$$
$$x > 28.2743338823081 \wedge x < 29.845130209103$$
$$x > 42.4115008234622 \wedge x < 43.9822971502571$$
$$x > 50.2654824574367 \wedge x < 51.8362787842316$$
$$x > 64.4026493985908 \wedge x < 65.9734457253857$$
$$x > 72.2566310325652 \wedge x < 73.8274273593601$$
$$x > 86.3937979737193 \wedge x < 87.9645943005142$$
$$x > 94.2477796076938 \wedge x < 95.8185759344887$$
$$x > 4393.51732604533$$
Solución de la desigualdad en el gráfico
Gráfico
|sinx|+|cosx|>1 desigualdades