thank you, i haven't learned partial derivatives yet, but i will try to figure that out and I am guessing i will be able to use some trig id. after i take the partial derivative.
Homework Statement
using only trigonometric identities, derive the differential area element in polar coordinates? any help with this problem or at least a start?
Homework Equations
i found this so far
dA=(dr)(rd θ)
The Attempt at a Solution
i have tried to figure this one out...