Question

How do you evaluate `arcsin (3/5)`?

Answer 1

The base triangle for `arcsin(3/5)` is obviously a 3-4-5 right-angles triangle but unfortunately this is not one of the standard angle triangles.

I think the only way to evaluate this is using a calculator (or something similar) to get
`arcsin(3/5) = 0.643501` radians or `36.8699^@`