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化简:sin(π-α)cos(-α-2π)cot(α+π)+sin2(-α)-tan(2π-α)cotα=________.

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.化简:

(1) =________;

(2)sin2(-α)-tan(360°-α)tan(-α)-sin(180°-α)cos(360°-α)tan(180°+α)=________;

(3) =________.

 

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