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设θ∈(0,派)若sin(θ+7派/4)+cos(θ-3派/4)=根号5/2..则tan2θ等于多少
人气:329 ℃ 时间:2020-05-24 11:11:23
解答
sin(θ+7π/4)+cos(θ-3π/4)=根号5/2∴ sin(θ-π/4+2π)+cos(θ+π/4-π)=根号5/2∴ sin(θ-π/4)-cos(θ+π/4)=根号5/2∴ sin(θ-π/4)-cos(θ-π/4+π/2)=根号5/2∴ 2 sin(θ-π/4)=根号...
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