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10 May, 17:13

Find cos (2theta) if cos (theta) = 3/4

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  1. 10 May, 17:23
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    Sin theta = 8/17 and theta is in the second quadrant. Find sin (2theta), cos (2theta), tan (2theta) exactly sin (2theta) cos (2theta) tan (2theta) sin (2theta) would it be 2 x (8/17) cos (2theta) would be 2 x (15/17) tan (2theta) would be 2 x (8/17 divided by 15/17) is this correct?
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