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数学
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证明sinθ+cosθ=根号2sin(θ+π/4)
人气:481 ℃ 时间:2020-02-05 13:03:19
解答
右式=根号2sin(θ+π/4)=根号2(sinθcosπ/4+cosθsinπ/4)=sinθ+cosθ=左式
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