Question

How do you use a calculator to evaluate `sin^-1 (0.99)` in both radians and degree?

Answer 1

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`pi/180`.

Explanation:

The 10-sd degree-mode calculator display

for `sin^(-1)(0.99)`

`= 81.89038554.`

To convert this to radian measure, divide by 180 and multiply by

`pi`.

Now the display

1.429256853 is the angle in radian unit.