HELP ON 2 TRIG IDENTITIES!

[eahn176]

1)how to solve: csc2x+cot2x=cotx

2) Express sin7x+sin3x as a product of only sines or cosines.

THANK YOU!!!

 

[royhaas]

1. Express in terms of \(\displaystyle \sin(x), \cos(x)\).
2. Use \(\displaystyle \sin(A+B)+\sin(A-B)\).