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数学
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已知cos2α=3/5,求sin^α-cos^4α的值
人气:335 ℃ 时间:2020-05-20 04:58:14
解答
cos2α=cos²α-sin²α=3/5
所以原式=(cos²α+sin²α)(cos²α-sin²α)
=1×3/5
=3/5
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