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Converting polar to cartesian coordinates

  • Thread starter bobsmith76
  • Start date
  • #1
336
0

Homework Statement



Screenshot2012-02-16at15012AM.png


Homework Equations



Screenshot2012-02-16at15136AM.png


The Attempt at a Solution



Do you see that 2 between A and the integral? There's no 2 in the above equation. I don't see where that 2 came from. Everything else is fine.
 

Answers and Replies

  • #2
46
0
The 2 comes from the symmetry. 0 to pi/4 on the sine circle is only calculating the bottom-right half of the area.
 
  • #3
57
0
because if you just did it with no 2*the integral then you would only get the area of half of your region
 

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