$$$\operatorname{atan}{\left(1 \right)}$$$

求$$$\operatorname{atan}{\left(1 \right)}$$$。

$$$\operatorname{atan}{\left(1 \right)} = \frac{\pi}{4}\approx 0.785398163397448$$$A

$$$\operatorname{atan}{\left(1 \right)} = 45^{\circ}$$$A

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