## Multivariable Calculus, 7th Edition

$4r = \frac{cotθ}{sinθ}$
$4y^{2} = x$ $4(rsinθ^{2}) = rcosθ$ $4r(sinθ^{2}) = cosθ$ $4r = \frac{cosθ}{sinθ^{2}}$ $4r = \frac{cotθ}{sinθ}$