Question

suppose z=f(x,y) is express in polar form z=(r, @) by making x=rcos@ and y=rsin@

Answer 1

couldnt open question at first

Answer 2

so dx/dr = cos @ what is next

Answer 3

u need dr/dx, right ?
dr/dx = 1/ (dx/dr)

Answer 4

you mean 1=cos @ dr/dx?

Answer 5

yeah, so
dr/dx = 1/cos@

Answer 6

but the answer said it is cos @ and not 1/cos@

Answer 7

ok, let me try

Answer 8

r^2 = x^2+y^2

Answer 9

2r dr/dx = 2x

dr/dx = x/r

Answer 10

dr/dx = rcos @/r

Answer 11

hmm....i am getting cos @ now...

Answer 12

did u get what i did ?

Answer 13

ya

Answer 14

the wording of the question is just confusing

Answer 15

thanks again

Answer 16

welcome ^_^