Question

What is `arcsin(sin(1/4))` ?

Answer 1

`arcsin(sin(1/4))=color(green)(1/4)`

Explanation:

By definition the `arcsin` function returns a value in the range `[0,pi)`

As long as `theta` is in the range `[0,pi)`
`color(white)("XXX")arcsin(sin(theta))=theta`