问题标题:
证明sinθ+cosθ=根号2sin(θ+π/4)
问题描述:
证明sinθ+cosθ=根号2sin(θ+π/4)
孔亚广回答:
右式=根号2sin(θ+π/4)=根号2(sinθcosπ/4+cosθsinπ/4)=sinθ+cosθ=左式
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证明sinθ+cosθ=根号2sin(θ+π/4)