Respuesta :

Step-by-step explanation:

Im use x instead of theta.

[tex]2 \sin(x) = \sin(2x) [/tex]

[tex]2 \sin(x) = 2 \sin(x) \cos(x) [/tex]

[tex]1 = \cos(x) [/tex]

[tex]x = 0[/tex]