If cosA = 3/5, 0deg <A<90deg write sinA as a fraction.

Hence write cos2A as a fraction.

I've got the first part sinA as a fraction, 4/5 . The second part, cos2A as a fraction is getting me. Any help?

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- Dec 2nd 2009, 11:17 AMzyx.garCompound Angles
If cosA = 3/5, 0deg <A<90deg write sinA as a fraction.

Hence write cos2A as a fraction.

I've got the first part sinA as a fraction, 4/5 . The second part, cos2A as a fraction is getting me. Any help? - Dec 2nd 2009, 12:24 PMmasters