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提问sin(π/4-θ)=1/3,则sin(π/4+θ)=
人气:283 ℃ 时间:2020-08-01 15:55:59
解答
sin²(π/4-θ)+cos²(π/4-θ)=1
所以cos(π/4-θ)=±2√2/3
sin(π/4+θ)
=cos[π/2-(π/4+θ)]
=cos(π/4-θ)
=±2√2/3
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