Question

помогите решить пожалуйста

Answer 1

$sin(3x)+sin(x)=0 \ 2sin(2x)*cos(x)=0 \ left { {{sin(2x)=0} atop {cos(x)=0}} right. textless = textgreater left { {{2x= pi k, kOZ} atop {x=frac{pi}{2}+2pi n, nOZ}} right. textless = textgreater left { {x=frac{pi k}{2}, kOZ} atop {x=frac{pi}{2}+2pi n, nOZ}} right.$