Question

What is `arcsin (4/5)`?

Answer 1

Find `arcsin (4/5)`

Explanation:

Use calculator to find:
`sin x = 4/5 = 0.80` --> `x = 52.13` deg

Trig unit circle gives another arc x that has the same sine value ->

`x = 180 - 52.13 = 127.87` deg