Question

sin x - cos (п/2 + x) + sin x (п + x) = 0

Answer 1

$\sin x-\cos ( \frac{ \pi }{2} +x)+\sin ( \pi +x)=0\\ \\ \sin x+\sin x-\sin x=0\\ \\ \sin x=0\\ \\ x= \pi k,k \in \mathbb{Z}$