Question

How do you evaluate `arcsin(.4)`?

Answer 1

Evaluate arcsin (0.4)

Ans: 23. 58 and 156.42 deg

Explanation:

sin x = 0.40
Calculator gives --> `x = 23.58` deg
Trig unit circle gives another arc x that has the same sin value:
`x = 180 - 23.58 = 156.42` deg