ln√x∧2－1的导数

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ln√x∧2－1的导数(图1)
======以下答案可供参考======
供参考答案1:
=(1/(√x^2-1))*(√x^2-1)'
=(1/(√x^2-1))*(2/3*(√x^2-1)^3/2)*(x^2-1)'
=(1/(√x^2-1))*(2/3*(x^2-1)^3/2)*(1/3*x^3)
=2/9*x^3*(x+1)*(x-1)