Arcsine — Precalculus, what it means and where it is taught
The inverse of sine, restricted to outputs from -90° to 90°.
Taught in Precalculus.
Where it is taught
What it rests on
Work through these first if this one does not settle.
- Sine — sin θ = oppositehypotenuse.
Practise this idea
2 questions in the course bank use Arcsine, in Inverse Trigonometric Functions.
Problem 1
Find arcsin(-12) in degrees.
Worked answer
-30
Reference angle 30°
Arcsine returns -90° to 90°, so -30°
Problem 2
Evaluate arcsin(sin 150°) in degrees.
Worked answer
30
sin 150° = 12
The angle in [-90°, 90°] with that sine is 30°