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$$$\operatorname{atan}{\left(-1 \right)}$$$
The calculator will find the inverse tangent of $$$-1$$$ in degrees and radians.
Related calculator: Inverse Tangent Calculator
Answer
$$$\operatorname{atan}{\left(-1 \right)} = - \frac{\pi}{4}\approx -0.785398163397448$$$A
$$$\operatorname{atan}{\left(-1 \right)} = -45^{\circ}$$$A
For graph, see the graphing calculator.