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OpenStudy (anonymous):
prove the identity tan 2x=2tanx/1-tan^2x i know this seems really basic, but for some reason, I CAN'T GET IT AND IT IS REALLY FRUSTRATING ME ;_; I just want to go sleep already lol D:
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OpenStudy (anonymous):
this is what i got so far: |dw:1388302236851:dw|
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