Double Integral in polar coordinates

2013 7 14
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Hi. I have a problem with the answer of this integral code:
syms r theta
a = r*cos(theta);
b = r*sin(theta);
Q = (1/(2*pi*L)) * exp( - (a^2 + b^2)/(2*L))*f;
q = int(int(Q,r,0,L),theta,0,pi/2);
Where the values of L and f are calculated in the code before this integral. But the answer of q is 1*1sym and it doesn't show the value. I really appreciate if you let me know my mistake.
Thanks

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Ferra
Ferra
2013-7-14

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