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式子sin4θ+cos2θ+sin2θcos2θ的结果是
人气:289 ℃ 时间:2020-03-24 03:01:56
解答
sin^4θ+cos^2θ+sin^2θcos^2θ
=sin^4θ+sin^2θcos^2θ+cos^2θ
=sin²θ(sin²θ+cos²θ)+cos²θ
=sin²θ+cos²θ
=1
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