Question

How do you find the exact value of `arcsin1`?

Answer 1

`arcsin(1)=pi/2`

Explanation:

By general definition the `arcsin` function is defined as having a range `[0,pi)`

If we want a value `theta= arcsin(1)`
or, as an alternate view, `sin(theta)=1`

Within the range `[0,pi)` the only value for `theta` that satisfies this condition is `theta=pi/2`