作业帮划线的～
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/11 00:07:50
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划线的～
划线的～
划线的～
sinθ+cosθ
=√2(√2/2sinθ+√2/2cosθ)
=√2(sinθcos(π/4)+sin(π/4)cosθ)
=√2sin(θ+π/4)
sinθ+cosθ=√2((sinπ/4)×(sinθ)+(cosπ/4)×cosθ)=√2sin(π/4+θ)