- #1
markapplegate
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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 but i really have no clue how to start the problem, i tried taking derivatives but got no where , I am not sure how to use a trigonometric identitie in this problem?