Thudinh777id Thudinh777id Mathematics Answered sin 6x +4sin²3x= 0 sin x + sin 5x = sin 2x . sin 3x tan 4x. tan 2x = -1 sin 5x + cos 5x - sin x + cos x =√2 cos 3x cos 5x . cos x + sin³2x = cos 3x . cos x