Arctan Calculator 📐 - calculates arctan(x) of a number
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arctan2 – Wikipedia
homework and exercises - Calculate the charge distribution given the potential $\Phi(x,y) = 2(\tan^{-1}(\frac{1+x}{y}) + \tan^{-1}(\frac{1-x}{y}))$ - Physics Stack Exchange
Arctan - Formula, Graph, Identities, Domain and Range | Arctan x
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