已知y=ln(1+x^2)求d^2y/dx^2
2个回答
dy/dx=1/(1+x^2)*(1+x^2)'=2x/(1+x^2)
d^2y/dx^2
=[2(1+x^2)-2x*2x]/(1+x^2)^2
=(2-2x^2)/(1+x^2)^2
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