INVERSE TRIG FUNCTIONS Evaluating (Page 2 of 10)

On the Home screen, press the key for the inverse sine function (above the SIN key), type in the argument, then close the parentheses and enter the command. The result shown is the angle in decimal degrees.

 2nd QUIT key. CLEAR key.

 2nd key. 2nd inverse sine key. 0.5 Right parenthesis key. ENTER key.

 Calculator screen image.

We see that an angle of 30° has a sine of 0.5. The other inverse function keys are used in similar fashion. For example, let's approximate arccos(0.7811).

  2nd inverse cosine key. 0.7811 Right parenthesis key. ENTER key. Calculator screen image.
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