Evaluate the double integral int 0 ^ infty int 0 ^ infty e ^ (- (x ^ 2 + y ^ 2)) dxdy and hence deduce that the value of integrate e ^ (- x ^ 2) dx from 0 to ∞ by changing into polar coordinateEvaluate the double integral int 0 ^ infty int 0 ^ infty e ^ (- (x ^ 2 + y ^ 2)) dxdy and hence deduce that the value of integrate e ^ (- x ^ 2) dx from 0 to ∞ by changing into polar coordinate
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