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## Homework Statement

Tan∅ dr + 2r d∅=0

## Homework Equations

## The Attempt at a Solution

∫1/2r dr +∫1/tan∅ d∅=0

1/2ln(2r)+ln(tan∅)=c

ln[r(tan∅)]=ln(c)

r(tan∅)=c

the solution in the book says the answer is rsin^2∅=c

Where did I go wrong?

Thank you