Question

$\displaystyle \sf \int_{ - \infty}^{ \infty} {e}^{ - {x}^{2} } {e}^{ - \frac{1}{ {x}^{2} } } \: dx$

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Answer 1

Answer:

$\huge \green{ \frac{ \sqrt{\pi} }{ {e}^{2} }}$