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数学
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化简sin(θ-5π)cos(π/2+θ)cos(4π-θ)/cos(3π-θ)sin(θ-3π)sin(-θ-4π)
人气:365 ℃ 时间:2020-04-27 12:22:05
解答
原式=-sin(θ)*(-1)sin(θ)cos(θ)/-cos(θ)*(-1)sin(θ)*(-1)sin(θ)=-1
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