化简3.cos(27+α)cos(33-α)-sin(27+α)sin(33-α)化简cos(27+

发布时间：2021-02-19 20:47:50

化简3.cos(27+α)cos(33-α)-sin(27+α)sin(33-α)化简cos(27+α)cos(33-α)-sin(27+α)sin(33-α)

网友回答

cos(27°+α)cos(33°-α)-sin(27°+α)sin(33°-α)
=cos[(27°+α)+(33°-α)]
=cos60°
=1/2
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