Answer:
undefined
Explanation:
You want the angle whose sine is -5π/7.
Sine
The sine function only gives values in the range [-1, 1], so the sine of a real angle cannot be -5π/7 ≈ -2.244.
sin⁻¹(-5π/7) is undefined
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Additional comment
Actually, the usual functions (log, trig, root) have definitions for all complex numbers. The given expression evaluates to approximately -1.572 +1.448i, a complex number. (The usual vertical asymptotes still apply.)
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