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The arctangent appears "naturally" as the antiderivative of a rational function. In particular, <math>\int\frac{dx}{1+x^2}=\arctan x</math>
The arctangent appears "naturally" as the antiderivative of a rational function. In particular, <math>\int\frac{dx}{1+x^2}=\arctan x</math>
[[category:Trigonometry]]
[[Category:Trigonometry]]