COS A COS B：二倍角公式及其推导过程 - CSDN博客

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cos a cos b zalora lacoste bag 首先先给出欧拉公式：eix=cosx+isinxe^ix=cosx+isinxeix=cosx+isinx将实数作为横轴，虚数作为纵轴，欧拉公式用在复平面表示如下：而当此时的x取圆周率Π时可以得到欧拉恒等式：eiπ+1=0e^i\pi+1=0eiπ+1=0欧拉恒等式被誉

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