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化简cos^4角+sin^2角cos^2角+sin^2角
人气:148 ℃ 时间:2020-01-30 04:53:32
解答
=(cos^2(x))^2+sin^2(x)cos^2(x)+sin^2(x)
=cos^2(x)(sin^2(x)+cos^2(x))+sin^2(x)
=cos^2(x)+sin^2(x)
=1
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