Trigonometry- verify the identity

[Srobinson]

I have to verify these identities. I really need help on these!

 

[mmm4444bot]

I really need help on these!

Please do not post a list of exercises with no work shown. What kind of help do you need?

At this site, we ask that you show how far you got (or explain why you're stuck).

Please start here. Thank you. :cool: