批改网手机版下载:若sinθ+sin^2θ=1,求cos^2θ+cos^6θ+cos^8θ=?
来源:百度文库 编辑:高校问答 时间:2024/07/07 08:53:28
过程!
解:sinθ+sin^2θ=1
cos^2θ=sinθ
cos^2θ+cos^6θ+cos^8θ=sinθ+sin^3θ+sin^4θ=sinθ+sinθ(1-sinθ)+(1-sinθ)^2=1
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