This is called trig identities

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Question description

This is called trig identities (i think) honestly i dont know anything about this at all. i have no clue what the question even is. I missed school for a week and we learned this when i was gone. My confusion is how to solve it, WHAT I AM EVEN LOOKING FOR, the formula, and the process. Sorry i am being difficult i have just watched so many videos and i swear i have no clue what is even going on in the videos because i dont even know what the question is. 

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(Top Tutor) Daniel C.
School: UIUC
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