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From what I currently know for converting rectangular to cylindrical:

$r = \sqrt{x^2+y^2}$ ---OR---> $r^2 = x^2+y^2$

$\theta = tan^{-1}(y/x)$

$z = z$

I'm trying to convert, $z(x+y)$, for doing my triple integral in cylindrical coordinates.

I can't think of how to go about converting the x+y portion

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$x=r\cos \theta$

$y=r\sin \theta$

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    $\begingroup$ Oh...that was on my sheet but it said cylindrical to rectangular, so I thought it didn't apply. Thank you! $\endgroup$
    – Amai
    Commented Nov 25, 2019 at 6:22
  • $\begingroup$ You're welcome :-) $\endgroup$ Commented Nov 25, 2019 at 6:28

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