APM346-2022S > Chapter 1

Question about the posted solution for HW1 3c

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Yuanhan (Phyllis) Peng:
I am confused about why when we integrate the left hand side Ux/e^u, we used the x' in Ux(x', y) expression, but we didn't change x in e^u(x,y)

The screenshot is attached.

Victor Ivrii:
It was a misprint; it should be $e^{u(x',y)}$ in the denominator