Question

sin3x*cosx+cos3x*sinx=0

Answer 1

sin3x*cosx+cos3xsinx=0
sin(3x+x)=0
sin4x=0
4x=(-1)^n*arcsin o+Пn
x=(-1)^n+Пn/4

Answer 2

sin3x*cosx+cos3x*sinx=0

sin(3x+x)=0

sin4x=0

4x=Пn

x=Пn/4