Question

2cos²x=√3sin(1,5Π+x)

Answer 1

$2\cos^2x= \sqrt{3} \sin(1.5 \pi +x)\\ \\ 2\cos^2x=-\sqrt{3} \cos x\\ \\ 2\cos^2x+\sqrt{3} \cos x=0 \\ \\ \cos x(2\cos x+\sqrt{3} )=0\\ \\ \left[\begin{array}{ccc}\cos x=0\\ \cos x=- \frac{\sqrt{3} }{2} \end{array}\right~~~~~\Rightarrow~~~~~~~ \left[\begin{array}{ccc}x_1= \frac{\pi}{2}+ \pi n,n \in \mathbb{Z}\\ x_2=\pm \frac{5 \pi }{6} +2 \pi n,n \in \mathbb{Z} \end{array}\right$