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已知函数f(x)=asin(πx+α)+bcos(πx+β)+4,x∈R,且f(...
已知函数f(x)=asin(πx+α)+bcos(πx+β)+4,x∈R,且f(2010)=2,则f(2011)的值为 .
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已知
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,且
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与
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的夹角为60°,则
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与
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的夹角为
.
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sin62°cos58°+cos62°sin122°的值为
.
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设α是一个任意角,它的终边与单位圆交于点P(x,y),由此定义了正弦(sinα)、余弦(cosα)、正切(tanα),其实还有另外三个三角函数,分别是:余切(
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)、正割(
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)、余割(
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).则下列关系式错误的是( )
A.
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B.
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C.
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D.cot
2α-csc
2α=1
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