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就是說在正半軸φ(x)=ke^(-x)(x>;0)在負半軸φ(x)=ke^x(x<;0),它們都是指數函數,且關於y軸對稱.求A可對函數求積分,由於對稱性,兩邊積分應該相等,而和是1,所以一邊是1/2,ke^(-x)求積分(0到正無窮大)得到k=1/2
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