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sin(2*x)*sin(5*x)+cos(2*x)*cos(5*x)>-sqrt3/2 desigualdades

En la desigualdad la incógnita

Solución

Ha introducido [src]
                                           ___ 
                                        -\/ 3  
sin(2*x)*sin(5*x) + cos(2*x)*cos(5*x) > -------
                                           2   
$$\sin{\left(2 x \right)} \sin{\left(5 x \right)} + \cos{\left(2 x \right)} \cos{\left(5 x \right)} > \frac{\left(-1\right) \sqrt{3}}{2}$$
sin(2*x)*sin(5*x) + cos(2*x)*cos(5*x) > (-sqrt(3))/2
Solución de la desigualdad en el gráfico
Respuesta rápida [src]
  /   /                  /   _____________\\     /                   /   _____________\           \\
  |   |                  |  /         ___ ||     |                   |  /         ___ |           ||
  |   |            2*atan\\/  7 + 4*\/ 3  /|     |     2*pi    2*atan\\/  7 + 4*\/ 3  /   2*pi    ||
Or|And|0 <= x, x < ------------------------|, And|x <= ----, - ------------------------ + ---- < x||
  \   \                       3            /     \      3                 3                3      //
$$\left(0 \leq x \wedge x < \frac{2 \operatorname{atan}{\left(\sqrt{4 \sqrt{3} + 7} \right)}}{3}\right) \vee \left(x \leq \frac{2 \pi}{3} \wedge - \frac{2 \operatorname{atan}{\left(\sqrt{4 \sqrt{3} + 7} \right)}}{3} + \frac{2 \pi}{3} < x\right)$$
((0 <= x)∧(x < 2*atan(sqrt(7 + 4*sqrt(3)))/3))∨((x <= 2*pi/3)∧(-2*atan(sqrt(7 + 4*sqrt(3)))/3 + 2*pi/3 < x))
Respuesta rápida 2 [src]
          /   _____________\             /   _____________\              
          |  /         ___ |             |  /         ___ |              
    2*atan\\/  7 + 4*\/ 3  /       2*atan\\/  7 + 4*\/ 3  /   2*pi  2*pi 
[0, ------------------------) U (- ------------------------ + ----, ----]
               3                              3                3     3   
$$x\ in\ \left[0, \frac{2 \operatorname{atan}{\left(\sqrt{4 \sqrt{3} + 7} \right)}}{3}\right) \cup \left(- \frac{2 \operatorname{atan}{\left(\sqrt{4 \sqrt{3} + 7} \right)}}{3} + \frac{2 \pi}{3}, \frac{2 \pi}{3}\right]$$
x in Union(Interval.Ropen(0, 2*atan(sqrt(4*sqrt(3) + 7))/3), Interval.Lopen(-2*atan(sqrt(4*sqrt(3) + 7))/3 + 2*pi/3, 2*pi/3))