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z=x+iy對照一下,x=acost,y=bsint複數方程是為了計算複數開放引進的,沒有真實的意義.引進後發覺將實部與x座標對應,虛部與y座標對應,可以方便地處理平面幾何問題,特別是轉動,只要將z=x+iy乘以e^ia=cosa+isina就可以得…
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