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:
$$x < -95.8185759344887$$
_____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____
\ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ / \ /
-------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-------
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:
$$x < -95.8185759344887$$
$$x > -94.2477796076938 \wedge x < -89.5353906273091$$
$$x > -87.9645943005142 \wedge x < -81.6814089933346$$
$$x > -80.1106126665397 \wedge x < -73.8274273593601$$
$$x > -72.2566310325652 \wedge x < -67.5442420521806$$
$$x > -65.9734457253857 \wedge x < -59.6902604182061$$
$$x > -58.1194640914112 \wedge x < -51.8362787842316$$
$$x > -50.2654824574367 \wedge x < -48.6946861306418$$
$$x > -45.553093477052 \wedge x < -43.9822971502571$$
$$x > -37.6991118430775 \wedge x < -36.1283155162826$$
$$x > -32.9867228626928 \wedge x < -29.845130209103$$
$$x > -28.2743338823081 \wedge x < -23.5619449019235$$
$$x > -21.9911485751286 \wedge x < -18.8495559215388$$
$$x > -17.2787595947439 \wedge x < -15.707963267949$$
$$x > -14.1371669411541 \wedge x < -7.85398163397448$$
$$x > -1.5707963267949 \wedge x < 0$$
$$x > 1.5707963267949 \wedge x < 6.28318530717959$$
$$x > 7.85398163397448 \wedge x < 20.4203522483337$$
$$x > 21.9911485751286 \wedge x < 26.7035375555132$$
$$x > 28.2743338823081 \wedge x < 29.845130209103$$
$$x > 42.4115008234622 \wedge x < 43.9822971502571$$
$$x > 50.2654824574367 \wedge x < 51.8362787842316$$
$$x > 64.4026493985908 \wedge x < 65.9734457253857$$
$$x > 72.2566310325652 \wedge x < 73.8274273593601$$
$$x > 86.3937979737193 \wedge x < 87.9645943005142$$
$$x > 94.2477796076938 \wedge x < 95.8185759344887$$
$$x > 4393.51732604533$$