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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)
人气：472 ℃　时间：2020-05-21 09:32:19
解答
cos(27°+α)cos(33°-α)-sin(27°+α)sin(33°-α)
=cos[(27°+α)+(33°-α)]
=cos60°
=1/2
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