Question

How do you calculate `sin^-1(9.4 / 12)`?

Answer 1

`51.57` degrees as also `128.43` degrees.

Explanation:

Sine of an angle can take value between `-1` and `+1`.

As `9.4/12=0.78333`, the angle whose sine is `0.78333` is `sin^-1(9.4/12)`.

Using a scientific calculator this comes out to `51.57` degrees. It can also be `180-51.57` i.e. `128.43` too as `sin(pi-theta)=sintheta`.

One can add multiples of 360 degrees too as it does not affect sine of an angle.