cos2x=(cosx)^2-(sinx)^2怎么推得等于1+2(cosx)^2=1-2(sinx)^2

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cos2x=(cosx)^2-(sinx)^2怎么推得等于1+2(cosx)^2=1-2(sinx)^2
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cos2x=(cosx)^2-(sinx)^2怎么推得等于1+2(cosx)^2=1-2(sinx)^2
cos2x=(cosx)^2-(sinx)^2怎么推得等于1+2(cosx)^2=1-2(sinx)^2

cos2x=(cosx)^2-(sinx)^2怎么推得等于1+2(cosx)^2=1-2(sinx)^2
cos^2 - sin^2 = cos^2 - (1-cos^2) = 2cos^2 - 1
= 1-sin^2 - sin^2 = 1 - 2cos^2

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