cos (a+b) cosenza calcio vs venezia 复数可以写成 A+Bi 的常规形式,其中 A 是实部,B 是虚部,i 是虚数单位,满足 i 2 =−1;也可以写成极坐标下的指数形式 R×e Pi ,其中 R 是复数模,P 是辐角,i 是虚数单位,其等价于三角形式 Rcos§+isin§。
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