Nothing strikes fear into the hearts of physicists quite like seeing a Gaussian integral pop up in their calculations. That notorious bell-shaped curve integral that somehow always equals √π? Yeah, that's when most physicists channel their inner Thanos and decide to take matters into their own hands rather than trudging through pages of substitutions and tricks.
The truth is, most physicists would rather snap half the universe out of existence than evaluate these monstrosities by hand. And who can blame them? After your third contour integration or polar coordinate transformation, you too might start collecting Infinity Stones.
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