I'm really struggling with establishing identities and I would seriously love some help.
Here are two questions I need answered:
https://i.imgur.com/BnFBQ33.png
and
https://i.imgur.com/nK2VeCH.png
I'm not sure where to start with either of these, and I really would like to know how to solve them and what the answers are. Any advice would be helpful!
Thanks in advance!! :)

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does it help to know that
\[\tan(\theta)=\frac{\sin(\theta)}{\cos(\theta)}\]?

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