(sin 3x + sin x) sin x + (cos 3x - cos x) cos x =0

Prove that: (sin 3 x +sin x) sin x + (cos 3x - cos x) cos x = 0

(sin3x + sin x) sin x + (cos3x-cos x) cos x = 0

Prove that (sin 3 x+sin x) sin x+(cos 3 x-cos x)cosx=0

Prove that: (sin3x+sin x)sin x+(cos3x-cos x)cos x=0

(sin x + sin 3x)/(cos x - cos 3x) = ?

Prove that (sin x + sin 3x + sin 5x + sin 7x)/(cos x + cos 3x + cos 5x + cos 7x ) = tan 4x

The period of the function f(x) = (sin x + sin 3x - sin 5x + sin 7x)/(cos x + cos 3x + cos 5x + cos 7x) is

If sin x - 3 sin 2x + sin 3x = cos x - 3 cos 2x + cos 3x then x =

Solve sin x-3 sin 2x + sin 3x = cos x -3 cos 2x + cos 3x .

Solve sin x-3 sin 2x + sin 3x = cos x -3 cos 2x + cos 3x .