解
cos(π/2-a)sin(π/2+a)
=sinacosa
=1/2(2sinacosa)
=1/2sin2aллľ�п�����ô�졣����������������ʲô���IJ�������һ�����ڶ���cos(��/2-a)sin(��/2+a)�ù�ʽ�ã�sinacosaȻ����sin2a=2sinacosaʲô��ʽ��
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