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The integral frac 1 sqrt 2 pi int limits - infty...

This question belongs to Engineering Maths Calculus
Calculus
?

The integral \[\frac{1}{{\sqrt {2\pi } }}\int\limits_{ - \infty }^\infty {{{\rm{e}}^{ - \frac{{{x^2}}}{2}}}} {\rm{dx}}\]    is equal to

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Correct Answer: Option C
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