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$$$\operatorname{asin}{\left(-1 \right)}$$$
The calculator will find the inverse sine of $$$-1$$$ in degrees and radians.
Related calculator: Inverse Sine Calculator
Answer
$$$\operatorname{asin}{\left(-1 \right)} = - \frac{\pi}{2}\approx -1.570796326794897$$$A
$$$\operatorname{asin}{\left(-1 \right)} = -90^{\circ}$$$A
For graph, see the graphing calculator.