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

Jul 29, 2016

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$\frac{\pi}{180}$.

#### Explanation:

The 10-sd degree-mode calculator display

for ${\sin}^{- 1} \left(0.99\right)$

$= 81.89038554 .$

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

$\pi$.

Now the display

1.429256853 is the angle in radian unit.