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y=f(x+2)的圖像關於x=0對稱,這是一個偶函數, 你可任意作一條關於y軸對稱的曲線,例如y=x^2, 表示y=f(x+2), 要把f(x+2)變成f(x),只要f(x-2+2)就=f(x), 所以只要把圖像向右平移2個組織,所求的對稱軸為x=2
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