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## Homework Statement

Find the first partial derivatives of:

1. f(x,y) = x^y

2. u = x^(y/z)

## Homework Equations

## The Attempt at a Solution

f_x = y*x^(y-1)

f_y = lnx?

u_x = (y/z)*x^((y/z)-1)

u_y = lnx/z?

u_z = ylnx/z?

I'm not really sure how to do these right. =/ I would really appreciate any help.