SOLUTION: Use double-angle formula to find th exact value of cos2u when sinu=5/13, where pi/2 < u < pi
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Question 1029970: Use double-angle formula to find th exact value of cos2u when sinu=5/13, where pi/2 < u < pi
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
Just do the arithmetic.
John
My calculator said it, I believe it, that settles it
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