SOLUTION: exact value of cos2x given that sinx = (sqrt of 3)/4

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Question 809251: exact value of cos2x given that sinx = (sqrt of 3)/4
Answer by lwsshak3(11628) About Me  (Show Source):
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exact value of cos2x given that sinx = (sqrt of 3)/4
sin%28x%29=sqrt%283%29%2F4
cos(2x)=1-2sin^2(x)=1-2*3/16=1-3/8=5/8