sin 2 x 3sin3 3. Prove the identity 2sin HX [T 4] 6 2sin x 1-cos x TE [Hints: (1) Begin by using identities to replace sin + X |on the left 6 side and sin 2x on the right side (2) Use the appropriate special triangle to determine the exact values of sin ( = ) and cos( = ) LS = 2sin -+X sin 2x 3 sin x RS = 6 2sinx 1-cos x 2 . . =2[ 3 sin x + 2 sin x 1- cos x