Question

Which is equivalent to sin-1(–0.4)? Round your answer to the nearest hundredth of a radian.

Answer 1

the answer is -0.41 I just took the test

Answer 2

let
A---------> the angle

if sin A=-0.4
then
A=sin-1(-0.4)
using a calculator
A=-23.578°--------> the angle A belong to the IV quadrant
convert to radians

if pi radians-----------> 180°
x-------------------> -23.578°
x=-23.578*pi/180--------> x=-0.41 radians

the answer is
-0.41 radians