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数学
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化简:1+sin(α—360°)cos(α—270°)—2(cosα)^2
人气:435 ℃ 时间:2020-01-28 08:23:45
解答
原式=sinα^2+cosα^2+sinαcos(α-∏-∏÷2)-2cosα^2
=sinα^2+cosα^2+sinα[-cos(α-∏÷2)]-2cosα^2
=sinα^2+cosα^2+sinα(-sinα)-2cosα^2
=sinα^2+cosα^2-sinα^2-2cosα^2
=-cosα^2
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