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(cos^3(x))*(cos(3x))-(sin^3(x))*(sin(3x))>5/8 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
   3                  3                  
cos (x)*cos(3*x) - sin (x)*sin(3*x) > 5/8
$$- \sin^{3}{\left(x \right)} \sin{\left(3 x \right)} + \cos^{3}{\left(x \right)} \cos{\left(3 x \right)} > \frac{5}{8}$$
-sin(x)^3*sin(3*x) + cos(x)^3*cos(3*x) > 5/8
Solución de la desigualdad en el gráfico
Respuesta rápida 2 [src]
         /  ___     ___\          /  ___     ___\     
         |\/ 2  - \/ 6 |          |\/ 2  + \/ 6 |  pi 
[0, -atan|-------------|) U (-atan|-------------|, --]
         |  ___     ___|          |  ___     ___|  2  
         \\/ 2  + \/ 6 /          \\/ 2  - \/ 6 /     
$$x\ in\ \left[0, - \operatorname{atan}{\left(\frac{- \sqrt{6} + \sqrt{2}}{\sqrt{2} + \sqrt{6}} \right)}\right) \cup \left(- \operatorname{atan}{\left(\frac{\sqrt{2} + \sqrt{6}}{- \sqrt{6} + \sqrt{2}} \right)}, \frac{\pi}{2}\right]$$
x in Union(Interval.Ropen(0, -atan((-sqrt(6) + sqrt(2))/(sqrt(2) + sqrt(6)))), Interval.Lopen(-atan((sqrt(2) + sqrt(6))/(-sqrt(6) + sqrt(2))), pi/2))
Respuesta rápida [src]
  /   /                /  ___     ___\\     /             /  ___     ___\    \\
  |   |                |\/ 6  - \/ 2 ||     |     pi      |\/ 2  + \/ 6 |    ||
Or|And|0 <= x, x < atan|-------------||, And|x <= --, atan|-------------| < x||
  |   |                |  ___     ___||     |     2       |  ___     ___|    ||
  \   \                \\/ 2  + \/ 6 //     \             \\/ 6  - \/ 2 /    //
$$\left(0 \leq x \wedge x < \operatorname{atan}{\left(\frac{- \sqrt{2} + \sqrt{6}}{\sqrt{2} + \sqrt{6}} \right)}\right) \vee \left(x \leq \frac{\pi}{2} \wedge \operatorname{atan}{\left(\frac{\sqrt{2} + \sqrt{6}}{- \sqrt{2} + \sqrt{6}} \right)} < x\right)$$
((0 <= x)∧(x < atan((sqrt(6) - sqrt(2))/(sqrt(2) + sqrt(6)))))∨((x <= pi/2)∧(atan((sqrt(2) + sqrt(6))/(sqrt(6) - sqrt(2))) < x))