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你畫一個直角三角形,直角邊分別為e^x,1 那麼,這個三角形的兩個銳角分別為arctan(e^x)和arctan(e^-x) 所以arctan(e^x)+arctan(e^-x)=90°,也就是π/2,為常數 所以積分結果為π/2*x,帶入上下限,最終結果為π^2/2
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