INVERSE TRIG FUNCTIONS Evaluating (Page 8 of 10)

If results are desired in radians, then make sure the calculator is in radian mode before evaluating the inverse trigonometric function. For example, let's find an angle in radians whose cosine is .

 MODE key. Down arrow key. Down arrow key. ENTER key.

 2nd QUIT key. CLEAR key.
 2nd inverse cosine key. 2nd Square root key. 3 Right parenthesis key. Divide key. 2 Right parenthesis key. ENTER key.

 Calculator screen image. Calculator screen image.

To convert this result to decimal degrees, multiply by 180/π.

 Multiply key. 180 Divide key. 2nd Pi key. ENTER key. Calculator screen image.
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