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(中诱导公式)sin60°cos(-45°)-sin(-420°)cos(-570°)的值等于( )
A.
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B.
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C.
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D.
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若A、B、C分别为△ABC的内角,则下列关系中正确的是( )
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B.cos(B+C)=cosA
C.tan(A+B)=tanC
D.sin(B+C)=-sinA
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若f(x)=
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tan(x-nπ)cot(
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若θ是第二象限角,那么sin(cosθ)•cos(sin2θ)的值所对应的符号是什么?
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