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Opposite Operators Cancel Each Other, Right?

Calculus Level 4

\[\int ^{1}_{-1}\frac{d}{dx} \left( \arctan \dfrac{1}{x} \right) \, dx = \, ? \]

\[ -\frac \pi 2\] \[0\] \[1\] \[ \frac \pi 2\]

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by Ankit Nigam

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