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

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Answer 1 · 2015-08-02T17:31:10

Evaluate arcsin (0.4)

Ans: 23. 58 and 156.42 deg

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

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