TRIGONOMETRIC FUNCTIONS Expressions (Page 3 of 8)

To evaluate a power of a trigonometric function, the trigonometric function must be entered within parentheses with the exponent outside the parentheses. For example, evaluate (cos(102.4deg))^2. Make sure you are in Degree mode.

 CLEAR key.

 Left parenthesis key. COS key. 102.4 Right parenthesis key. Right parenthesis key. x-squared key. ENTER key.

 Calculator screen image.

Next we will evaluate sqrt(87^2+14^2-2(87)(14)cos(73deg50min)), which might result from the Law of Cosines.

 2nd Square root key. 87 x-squared key. Plus key. 14 x-squared key. Minus key. 2 Multiply key. 87 Multiply key. 14
 COS key. 73 2nd ANGLE key. 1: menu selection. 50 2nd ANGLE key. 2: menu selection. Right parenthesis key. Right parenthesis key. ENTER key.		 Calculator screen image.
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