Answer:
x ≈ -0.34
Explanation:
You want to solve for x the equation sin(x) = -1/3.
Arcsin
The angle is found using the inverse sine function.
sin(x) = -1/3
x = arcsin(-1/3)
x ≈ 0.34 radians
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Additional comment
In degrees, the angle is about -19.47°. There is no indication here that the angle should be expressed in degrees.
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