anonymous
  • anonymous
Where do this mysterious R come from? (Look at Attachment) At the end, an r has SOMEHOW gotten inside the dr; which I do not understand. Where did it come from?!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
Q: Where do the R come from
caozeyuan
  • caozeyuan
http://tutorial.math.lamar.edu/Classes/CalcIII/TICylindricalCoords.aspx

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caozeyuan
  • caozeyuan
I hope this helps
anonymous
  • anonymous
I am aware of cylindrical coordinates; my problems are not the cylindrical coordinates. However, my question where they just pulled an extra R and put it in the formula.
caozeyuan
  • caozeyuan
If you look at the web I posted, there is an R when you transform dxdydz to drdthetadz,
anonymous
  • anonymous
since d(x,y,z) = 8, and we put it into the formula; there should not be an extra r though
anonymous
  • anonymous
Ill check it out further
caozeyuan
  • caozeyuan
This is because dxdy=rdrdtheta
anonymous
  • anonymous
ohh..
caozeyuan
  • caozeyuan
remember the area of circle is pi*r^2, right. Now pi turns into theta because the angle is not set to pi. And take infimitesimal of both r and theta, you end up with rdrdtheta
anonymous
  • anonymous
Thanks :)
amistre64
  • amistre64
Its a result of the Jacobian

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