Rewrite each expression as a sum or difference then simplify

Last updated: 3/28/2024

Rewrite each expression as a sum or difference then simplify if possible 15 10 sin 5x cos 3x 16 10 sin 5x sin 3x 17 cos 8x cos 2x 18 cos 2x sin 8x 19 sin 60 cos 30 20 cos 90 cos 180 21 sin 4 sin 2 22 cos 3 sin