化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
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化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
等于sin9cos9-sin9cos9=0
化简sin(171°)sin(99°)+sin(-171°)sin(-261°)
化简,①sin(-1071°)×sin99°+sin(-171°)×sin(261°)②1+sin(α-2π)×sin(π+α)-2cos2(-α)
sin(-1071)×sin99+sin(-171)×sin(-261)等于?
高一数学化简sin(-1071°)*sin99°+sin(-171°)*sin(-261°)
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化简sin(—1071°)乘以sin99°+sin(—171°)乘以sin(—261°)鄙人数学不好,请指教
sin(-1071度)×sin99度+sin(-171度)sin(-261度)化简
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化简sinA+sin(A+120°)+sin(A+240°)=?
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三角函数诱导公式化简2题.sin(-1071°)×sin99°+sin(-171°)×sin(-261°)1+sin(α-2π)×sin(π-α)-2cos^2(-α)
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求值:(tan10°-√3)×cos10°/sin50° 求证:[sin(2α+β)]/sinα- 2cos(α+β)=sinβ/cosα 化简cosθ+cos(θ+2π/3)+cos(θ+4π/3) 证明:sin(α+β)sin(α-β)=sin^2α-sin^2β