Resposta :
Oi Stefanyg,
[tex]\\ y = \sin(2x) + 2 \cdot \cos x \\ y = \sin(x + x) + 2 \cdot \cos x \\ y = 2 \cdot \sin x \cdot \cos x + \cos x \\ \boxed{y = \cos x\left ( 2 \cdot \sin x + 1 \right )}[/tex]
sen 2x = 2.sen x. cos x
y = 2 sen x. cos x + 2 cos x
y = cos x .(2 sen x + 1)