sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
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sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
sin²(π+α)-cos(π+α)*cos(-α+1)的值为?
sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
sin²(π+α)-cos(π+α)*cos(-α+π)
=sin²α-cos²α
=-cos2α