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The value of the integral int 0^ infty int 0^ infty...

This question belongs to Engineering Maths Calculus
Calculus
?

The value of the integral \[\int_0^\infty {\int_0^\infty {{{\text{e}}^{ - {{\text{x}}^2}}}{{\text{e}}^{ - {{\text{y}}^2}}}} } {\text{dx dy}}\]     is

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Correct Answer: Option D
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