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数学
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函数y=ln(x+根号下1+x²)的导函数为——
人气:465 ℃ 时间:2019-08-01 04:25:50
解答
y'=2x{1+1/[2根号下(1+x^2)]}/[x+根号下(1+x^2)]
=[1+x/根号(1+x^2)]/[x+根号(1+x^2)]
分式上下乘上[根号(1+x^2)-x]得
y'=[1+x/根号(1+x^2)][根号(1+x^2)-x]
=根号(1+x^2)-x+x-x^2/根号(1+x^2)
=1/根号(1+x^2)
=根号(1+x^2)/(1+x^2)
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