How do you use a calculator to evaluate #sin^-1 (0.99)# in both radians and degree?
In the absence of radian mode for library trigonometric functions in the calculator, convert angle in degrees, in the display, to angle in radian, by applying the factor
The 10-sd degree-mode calculator display
To convert this to radian measure, divide by 180 and multiply by
Now the display
1.429256853 is the angle in radian unit.