(1-√x)y=ln(1+√x)
两边同时取导数得到:
(1-√x)'y+(1-√x)y'=(√x)'/(1+√x)
-y√x/2x+y'(1-√x)=(1/2)/(x+√x)
化简出y'即可得到所求的导数。
y′
=[(1-√x)/(1+√x)][(1+√x)/(1-√x)]′
=[(1-√x)/(1+√x)]{[(1+√x)′(1-√x)-(1+√x)(1-√x)′]/(1-√x)^2}
=[1/(1-x)][(1+√x)′(1-√x)-(1+√x)(1-√x)′]
=[1/(1-x)][(1/2)(1-√x)/√x+(1/2)(1+√x)/√x]
=[1/(1-x)]/√x
=√x/(x-x^2)