# How do you use a calculator to evaluate sin^-1 (-0.4) in both radians and degree?

Nov 29, 2016

The order in which the keys are to be pressed is as follows.

Assuming that the calculator is in the degree mode, press

[SHIFT]
[SIN]
[$-$]
[.]
[4]
[=]

Answer in degrees is displayed at the top as
[113.5781785]

To convert to radian units, continue as follows
[$\div$]
[1]
8]
[0]
[X]
[SHIFT]
[EXP]
[=]
Note that [SHIFT] [EXP] gets the value of $\pi$.
In some calculators, this is directly available through [SHIFT] [$\pi$].