Question

find fy (x,y)=x^y

Answer 1

okay so:
fy = derivative with respect to y..

Answer 2

let:
a =f(x;y)= x^y
a = x^y
lna = lnx^y
lna = ylnx

Answer 3

[1/a][da/dy] = lnx
a = x^y
da/dy = fy = a*lnx = x^y * lnx