Question 679902: Evaluate cos(arcsin (12/13) + arctan (3/4)) . (No calculator answers, please-show all of your work, writing your final answers as a fraction)
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Evaluate cos(arcsin (12/13) + arctan (3/4)) . (No calculator answers, please-show all of your work, writing your final answers as a fraction)
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If the sin is 12/13, y = 12 when r = 13
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The x = sqrt[r^2-y^2] = sqrt[169-144] = sqrt(25) = 5
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Ans: cos = x/r = 5/13
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Cheers,
Stan H.
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