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(1+cosx)(1-cosx)= 1 +cosx - cosx -cos^2x (where ^2 means squared)

= 1-cos^2x = sin^2x (sin squared x)

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โˆ™ 2015-11-26 08:05:04
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โˆ™ 2015-06-24 12:25:32

[1 + cos(x)]*[(1 - cos(x)] = 1 - cos^2(x) = sin^2(x)

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Q: What is (1 plus cos x)(1- cos x)?
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