Using the Function Keys on the Calculator

There are three function keys on the calculator.

Example: If you need the cosine of a 45° angle, enter 45 and push the cos key.

The number in the display is the cosine of a 45° angle.

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Using the Function Keys: Practice

Find the indicated function for each angle below. Round off to 4 decimal places.

   (1)  tan 45°         (5)  cos 54° 
   (2)  sin 33°         (6)  tan 75° 
   (3)  cos 25°         (7)  sin 89° 
   (4)  sin 60°         (8)  cos 60° 

Answers.