Answer
Using the sketch of the graph, we can see that $sin^{-1}(0.4) \approx 0.41~rad$
Note that $~~0.41~rad~~$ is about $~~23.5^{\circ}$
Work Step by Step
$y = sin^{-1}~x$
Using the sketch of the graph, we can see that $sin^{-1}(0.4) \approx 0.41~rad$
We can express $0.41~rad$ in degrees:
$0.41~rad\cdot \frac{180^{\circ}}{\pi~rad} = 23.5^{\circ}$
