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偶函数f(x)在[-1,0]上单调递减,α,β为锐角三角形两内角,则不等式恒成立...
偶函数f(x)在[-1,0]上单调递减,α,β为锐角三角形两内角,则不等式恒成立的是( )
A.f(sinα)>f(sinβ)
B.f(cosα)>f(cosβ)
C.f(sinα)>f(cosβ)
D.f(sinα)<f(cosβ)
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,半径是1,则扇形的圆心角是( )
A.
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B.
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C.
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D.
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若
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,
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,
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,则
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=( )
A.0
B.
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C.4+2k
D.8+k
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设α,β是一个钝角三角形的两个锐角,下列四个不等式中不正确的是( )
A.tgatanβ<1
B.sinα+sinβ<
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C.cosα+cosβ>1
D.
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设
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,且sinα+sinγ=sinβ,cosβ+cosγ=cosα,则β-α等于( )
A.
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B.
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C.
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D.
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