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cos(t)<2/3 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
cos(t) < 2/3
$$\cos{\left(t \right)} < \frac{2}{3}$$
cos(t) < 2/3
Solución detallada
Se da la desigualdad:
$$\cos{\left(t \right)} < \frac{2}{3}$$
Para resolver esta desigualdad primero hay que resolver la ecuación correspondiente:
$$\cos{\left(t \right)} = \frac{2}{3}$$
Resolvemos:
Tenemos la ecuación
$$\cos{\left(t \right)} = \frac{2}{3}$$
cambiamos
$$\cos{\left(t \right)} - \frac{2}{3} = 0$$
$$\cos{\left(t \right)} - \frac{2}{3} = 0$$
Sustituimos
$$w = \cos{\left(t \right)}$$
Transportamos los términos libres (sin w)
del miembro izquierdo al derecho, obtenemos:
$$w = \frac{2}{3}$$
Obtenemos la respuesta: w = 2/3
hacemos cambio inverso
$$\cos{\left(t \right)} = w$$
sustituimos w:
$$x_{1} = -25.9738098992863$$
$$x_{2} = 80.8403403227667$$
$$x_{3} = -49.4244137868688$$
$$x_{4} = -5.44211663661166$$
$$x_{5} = -80.8403403227667$$
$$x_{6} = -11.7253019437912$$
$$x_{7} = -82.5224776639025$$
$$x_{8} = -7.12425397774752$$
$$x_{9} = 18.0084872509708$$
$$x_{10} = -57.3897364351842$$
$$x_{11} = -51.1065511280046$$
$$x_{12} = 82.5224776639025$$
$$x_{13} = -13.4074392849271$$
$$x_{14} = 13.4074392849271$$
$$x_{15} = -19.6906245921067$$
$$x_{16} = -44.823365820825$$
$$x_{17} = 19.6906245921067$$
$$x_{18} = 25.9738098992863$$
$$x_{19} = -55.7075990940483$$
$$x_{20} = 38.5401805136454$$
$$x_{21} = 69.9561070495434$$
$$x_{22} = 49.4244137868688$$
$$x_{23} = -74.5571550155871$$
$$x_{24} = 63.6729217423638$$
$$x_{25} = -69.9561070495434$$
$$x_{26} = -32.2569952064659$$
$$x_{27} = -38.5401805136454$$
$$x_{28} = 5.44211663661166$$
$$x_{29} = 44.823365820825$$
$$x_{30} = 76.239292356723$$
$$x_{31} = 57.3897364351842$$
$$x_{32} = -18.0084872509708$$
$$x_{33} = -101.372033585441$$
$$x_{34} = 74.5571550155871$$
$$x_{35} = 99.6898962443055$$
$$x_{36} = 87.1235256299463$$
$$x_{37} = 11.7253019437912$$
$$x_{38} = -68.2739697084075$$
$$x_{39} = 43.1412284796892$$
$$x_{40} = -0.84106867056793$$
$$x_{41} = 0.84106867056793$$
$$x_{42} = -87.1235256299463$$
$$x_{43} = 61.9907844012279$$
$$x_{44} = -36.8580431725096$$
$$x_{45} = -63.6729217423638$$
$$x_{46} = 88.8056629710821$$
$$x_{47} = -95.0888482782617$$
$$x_{48} = 32.2569952064659$$
$$x_{49} = -93.4067109371259$$
$$x_{50} = -43.1412284796892$$
$$x_{51} = -99.6898962443055$$
$$x_{52} = 68.2739697084075$$
$$x_{53} = -61.9907844012279$$
$$x_{54} = -24.2916725581504$$
$$x_{55} = 36.8580431725096$$
$$x_{56} = 51.1065511280046$$
$$x_{57} = 24.2916725581504$$
$$x_{58} = -88.8056629710821$$
$$x_{59} = 30.57485786533$$
$$x_{60} = -76.239292356723$$
$$x_{61} = 93.4067109371259$$
$$x_{62} = 7.12425397774752$$
$$x_{63} = 55.7075990940483$$
$$x_{64} = 95.0888482782617$$
$$x_{65} = -30.57485786533$$
$$x_{1} = -25.9738098992863$$
$$x_{2} = 80.8403403227667$$
$$x_{3} = -49.4244137868688$$
$$x_{4} = -5.44211663661166$$
$$x_{5} = -80.8403403227667$$
$$x_{6} = -11.7253019437912$$
$$x_{7} = -82.5224776639025$$
$$x_{8} = -7.12425397774752$$
$$x_{9} = 18.0084872509708$$
$$x_{10} = -57.3897364351842$$
$$x_{11} = -51.1065511280046$$
$$x_{12} = 82.5224776639025$$
$$x_{13} = -13.4074392849271$$
$$x_{14} = 13.4074392849271$$
$$x_{15} = -19.6906245921067$$
$$x_{16} = -44.823365820825$$
$$x_{17} = 19.6906245921067$$
$$x_{18} = 25.9738098992863$$
$$x_{19} = -55.7075990940483$$
$$x_{20} = 38.5401805136454$$
$$x_{21} = 69.9561070495434$$
$$x_{22} = 49.4244137868688$$
$$x_{23} = -74.5571550155871$$
$$x_{24} = 63.6729217423638$$
$$x_{25} = -69.9561070495434$$
$$x_{26} = -32.2569952064659$$
$$x_{27} = -38.5401805136454$$
$$x_{28} = 5.44211663661166$$
$$x_{29} = 44.823365820825$$
$$x_{30} = 76.239292356723$$
$$x_{31} = 57.3897364351842$$
$$x_{32} = -18.0084872509708$$
$$x_{33} = -101.372033585441$$
$$x_{34} = 74.5571550155871$$
$$x_{35} = 99.6898962443055$$
$$x_{36} = 87.1235256299463$$
$$x_{37} = 11.7253019437912$$
$$x_{38} = -68.2739697084075$$
$$x_{39} = 43.1412284796892$$
$$x_{40} = -0.84106867056793$$
$$x_{41} = 0.84106867056793$$
$$x_{42} = -87.1235256299463$$
$$x_{43} = 61.9907844012279$$
$$x_{44} = -36.8580431725096$$
$$x_{45} = -63.6729217423638$$
$$x_{46} = 88.8056629710821$$
$$x_{47} = -95.0888482782617$$
$$x_{48} = 32.2569952064659$$
$$x_{49} = -93.4067109371259$$
$$x_{50} = -43.1412284796892$$
$$x_{51} = -99.6898962443055$$
$$x_{52} = 68.2739697084075$$
$$x_{53} = -61.9907844012279$$
$$x_{54} = -24.2916725581504$$
$$x_{55} = 36.8580431725096$$
$$x_{56} = 51.1065511280046$$
$$x_{57} = 24.2916725581504$$
$$x_{58} = -88.8056629710821$$
$$x_{59} = 30.57485786533$$
$$x_{60} = -76.239292356723$$
$$x_{61} = 93.4067109371259$$
$$x_{62} = 7.12425397774752$$
$$x_{63} = 55.7075990940483$$
$$x_{64} = 95.0888482782617$$
$$x_{65} = -30.57485786533$$
Las raíces dadas
$$x_{33} = -101.372033585441$$
$$x_{51} = -99.6898962443055$$
$$x_{47} = -95.0888482782617$$
$$x_{49} = -93.4067109371259$$
$$x_{58} = -88.8056629710821$$
$$x_{42} = -87.1235256299463$$
$$x_{7} = -82.5224776639025$$
$$x_{5} = -80.8403403227667$$
$$x_{60} = -76.239292356723$$
$$x_{23} = -74.5571550155871$$
$$x_{25} = -69.9561070495434$$
$$x_{38} = -68.2739697084075$$
$$x_{45} = -63.6729217423638$$
$$x_{53} = -61.9907844012279$$
$$x_{10} = -57.3897364351842$$
$$x_{19} = -55.7075990940483$$
$$x_{11} = -51.1065511280046$$
$$x_{3} = -49.4244137868688$$
$$x_{16} = -44.823365820825$$
$$x_{50} = -43.1412284796892$$
$$x_{27} = -38.5401805136454$$
$$x_{44} = -36.8580431725096$$
$$x_{26} = -32.2569952064659$$
$$x_{65} = -30.57485786533$$
$$x_{1} = -25.9738098992863$$
$$x_{54} = -24.2916725581504$$
$$x_{15} = -19.6906245921067$$
$$x_{32} = -18.0084872509708$$
$$x_{13} = -13.4074392849271$$
$$x_{6} = -11.7253019437912$$
$$x_{8} = -7.12425397774752$$
$$x_{4} = -5.44211663661166$$
$$x_{40} = -0.84106867056793$$
$$x_{41} = 0.84106867056793$$
$$x_{28} = 5.44211663661166$$
$$x_{62} = 7.12425397774752$$
$$x_{37} = 11.7253019437912$$
$$x_{14} = 13.4074392849271$$
$$x_{9} = 18.0084872509708$$
$$x_{17} = 19.6906245921067$$
$$x_{57} = 24.2916725581504$$
$$x_{18} = 25.9738098992863$$
$$x_{59} = 30.57485786533$$
$$x_{48} = 32.2569952064659$$
$$x_{55} = 36.8580431725096$$
$$x_{20} = 38.5401805136454$$
$$x_{39} = 43.1412284796892$$
$$x_{29} = 44.823365820825$$
$$x_{22} = 49.4244137868688$$
$$x_{56} = 51.1065511280046$$
$$x_{63} = 55.7075990940483$$
$$x_{31} = 57.3897364351842$$
$$x_{43} = 61.9907844012279$$
$$x_{24} = 63.6729217423638$$
$$x_{52} = 68.2739697084075$$
$$x_{21} = 69.9561070495434$$
$$x_{34} = 74.5571550155871$$
$$x_{30} = 76.239292356723$$
$$x_{2} = 80.8403403227667$$
$$x_{12} = 82.5224776639025$$
$$x_{36} = 87.1235256299463$$
$$x_{46} = 88.8056629710821$$
$$x_{61} = 93.4067109371259$$
$$x_{64} = 95.0888482782617$$
$$x_{35} = 99.6898962443055$$
son puntos de cambio del signo de desigualdad en las soluciones.
Primero definámonos con el signo hasta el punto extremo izquierdo:
$$x_{0} < x_{33}$$
Consideremos, por ejemplo, el punto
$$x_{0} = x_{33} - \frac{1}{10}$$
=
$$-101.372033585441 + - \frac{1}{10}$$
=
$$-101.472033585441$$
lo sustituimos en la expresión
$$\cos{\left(t \right)} < \frac{2}{3}$$
$$\cos{\left(t \right)} < \frac{2}{3}$$
cos(t) < 2/3

Entonces
$$x < -101.372033585441$$
no se cumple
significa que una de las soluciones de nuestra ecuación será con:
$$x > -101.372033585441 \wedge x < -99.6898962443055$$
         _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____           _____  
        /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /     \         /
-------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-------
       x33      x51      x47      x49      x58      x42      x7      x5      x60      x23      x25      x38      x45      x53      x10      x19      x11      x3      x16      x50      x27      x44      x26      x65      x1      x54      x15      x32      x13      x6      x8      x4      x40      x41      x28      x62      x37      x14      x9      x17      x57      x18      x59      x48      x55      x20      x39      x29      x22      x56      x63      x31      x43      x24      x52      x21      x34      x30      x2      x12      x36      x46      x61      x64      x35

Recibiremos otras soluciones de la desigualdad pasando al polo siguiente etc.
etc.
Respuesta:
$$x > -101.372033585441 \wedge x < -99.6898962443055$$
$$x > -95.0888482782617 \wedge x < -93.4067109371259$$
$$x > -88.8056629710821 \wedge x < -87.1235256299463$$
$$x > -82.5224776639025 \wedge x < -80.8403403227667$$
$$x > -76.239292356723 \wedge x < -74.5571550155871$$
$$x > -69.9561070495434 \wedge x < -68.2739697084075$$
$$x > -63.6729217423638 \wedge x < -61.9907844012279$$
$$x > -57.3897364351842 \wedge x < -55.7075990940483$$
$$x > -51.1065511280046 \wedge x < -49.4244137868688$$
$$x > -44.823365820825 \wedge x < -43.1412284796892$$
$$x > -38.5401805136454 \wedge x < -36.8580431725096$$
$$x > -32.2569952064659 \wedge x < -30.57485786533$$
$$x > -25.9738098992863 \wedge x < -24.2916725581504$$
$$x > -19.6906245921067 \wedge x < -18.0084872509708$$
$$x > -13.4074392849271 \wedge x < -11.7253019437912$$
$$x > -7.12425397774752 \wedge x < -5.44211663661166$$
$$x > -0.84106867056793 \wedge x < 0.84106867056793$$
$$x > 5.44211663661166 \wedge x < 7.12425397774752$$
$$x > 11.7253019437912 \wedge x < 13.4074392849271$$
$$x > 18.0084872509708 \wedge x < 19.6906245921067$$
$$x > 24.2916725581504 \wedge x < 25.9738098992863$$
$$x > 30.57485786533 \wedge x < 32.2569952064659$$
$$x > 36.8580431725096 \wedge x < 38.5401805136454$$
$$x > 43.1412284796892 \wedge x < 44.823365820825$$
$$x > 49.4244137868688 \wedge x < 51.1065511280046$$
$$x > 55.7075990940483 \wedge x < 57.3897364351842$$
$$x > 61.9907844012279 \wedge x < 63.6729217423638$$
$$x > 68.2739697084075 \wedge x < 69.9561070495434$$
$$x > 74.5571550155871 \wedge x < 76.239292356723$$
$$x > 80.8403403227667 \wedge x < 82.5224776639025$$
$$x > 87.1235256299463 \wedge x < 88.8056629710821$$
$$x > 93.4067109371259 \wedge x < 95.0888482782617$$
$$x > 99.6898962443055$$
Respuesta rápida 2 [src]
     /  ___\        /  ___\        
     |\/ 5 |        |\/ 5 |        
(atan|-----|, - atan|-----| + 2*pi)
     \  2  /        \  2  /        
$$x\ in\ \left(\operatorname{atan}{\left(\frac{\sqrt{5}}{2} \right)}, - \operatorname{atan}{\left(\frac{\sqrt{5}}{2} \right)} + 2 \pi\right)$$
x in Interval.open(atan(sqrt(5)/2), -atan(sqrt(5)/2) + 2*pi)
Respuesta rápida [src]
   /          /  ___\             /  ___\    \
   |          |\/ 5 |             |\/ 5 |    |
And|t < - atan|-----| + 2*pi, atan|-----| < t|
   \          \  2  /             \  2  /    /
$$t < - \operatorname{atan}{\left(\frac{\sqrt{5}}{2} \right)} + 2 \pi \wedge \operatorname{atan}{\left(\frac{\sqrt{5}}{2} \right)} < t$$
(atan(sqrt(5)/2) < t)∧(t < -atan(sqrt(5)/2) + 2*pi)