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数学
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sin^4A+cos^2A+sin^2Acos^2A=?
人气：290 ℃ 时间：2020-04-08 14:31:04
解答
sin^4a+sin^2acos^2a+cos^2a
=sin^2a(sin^2a+cos^2a)+cos^2a
=sin^2a+cos^2a
=1
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