How do I solve this proof?

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asked May 19, 2019 147k views

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Jasti · Answer 1 · 2019-05-22T14:58:55+0000

Tany = siny/cosy. Tan2y= sin2y/cos2y Coty = cosy/siny. Sec2y = 1/cos2y. What you are trying to do is solve one side to equal the other. So you would chance tan and sec to sines and cosines

How do I solve this proof?

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