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OpenStudy (anonymous):
cosx=5/13 and sin y=3/5 what is the exact value of cos y?
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OpenStudy (anonymous):
4/5
OpenStudy (anonymous):
how did you get that?
OpenStudy (anonymous):
sin y = opposite side / hypotenuse = 3/5 cos y = adjacent side/ hypotenuse from pythagoras theorem, adjacent side = sqrt(hypotenuse^2-opposite side^2) = sqrt(5^2-3^2) = 4 so cos y = 4/5
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