Prove that sin x + sin 3x + sin 5x + sin 7x cos x + cos 3x + cos 5x + cos 7x = tan 4x .

Prove that $\frac{\sin x + \sin 3 x + \sin 5 x + \sin 7 x}{\cos x + \cos 3 x + \cos 5 x + \cos 7 x} = \tan 4 x$ .

Matching exercise

Match the items on the right to the items on the left.

STEP 1

STEP 2

STEP 3

STEP 3

STEP 5