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    Write an expression that is equivalent to the following expression using related...

    ...acute angle? okay so we're dong trig and I'm just lost on how to do these question, or even how to start it I REALLY NEED HELP please 1)sin 7?/8 2)tan 5?/8 3)cos13?/12 I have a test coming up and I really don't get this someone please helpme?? step by step would be helpful
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