1 sin 2x

(cos^2x) - (sin^2x) = 1-(2sin^2x) - Yahoo!知識+   你嚇誰啊小姐!尿都灑了一地了!prove the following identities(cos^ 2x) - ( sin^ 2x) = 1-(2sin^ 2x)有好多題數唔識,條條都係計到呢到唔識計 ......

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Does 1 - sin^2x = cos^2x? - Physics Forums - The Fusion of Science and Community   輕一點呦!人家怕疼!Does 1 - sin^2x = cos^ 2x? Discussion in 'Precalculus Mathematics Homework' started by bobsmith76, Jan 25 ......

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