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

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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