Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Quick question on double/triple integrals for area and volume

  1. Apr 19, 2014 #1
    I do not know how to formulate formulas on this forum so I just wrote it neatly on a piece of paper and linked it.

    http://puu.sh/8fwXr.jpg [Broken]

    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Apr 19, 2014 #2


    Staff: Mentor

    Would you edit your post to attach a new image that is smaller? The maximum width should be about 900 pixels. Yours is about 1200 pixels, so doesn't fit in the window.

    To answer your question. If f(x, y) = 0, then the integral will be zero.

    ##\int \int 0 dA = \int \int 0 r dr d\theta = 0##

    If the integrand is identically zero for any kind of integral, then the value of the integral is zero.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook