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Mathematical derivative operation of postgraduate entrance examination
There should be a limit here: y > 0.

Take the logarithm, lnx=y*lny.

Bilateral differential:1/xdx = d (ylny) = ydlny+lnydy = y *1/ydy+lnydy = (1+lny) dy.

So dy= 1/(x+xlny) dx.

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