TRIGONOMETRIC FUNCTIONS Evaluating (Page 2 of 15)

 2nd QUIT key. CLEAR key. SIN key. 120 Right parenthesis key. ENTER key.
 COS key. 120 Right parenthesis key. ENTER key.
 TAN key. 120 Right parenthesis key. ENTER key.		 Calculator screen image.

To evaluate the cosecant, secant and cotangent functions, we make use of the reciprocal key x to the -1 key.. The cosecant is the reciprocal of the sine, the secant is the reciprocal of the cosine, and the cotangent is the reciprocal of the tangent.

 SIN key. 120 Right parenthesis key. x to the -1 key. ENTER key.
 COS key. 120 Right parenthesis key. x to the -1 key. ENTER key.
 TAN key. 120 Right parenthesis key. x to the -1 key. ENTER key.		 Calculator screen image.

Thus, csc(120°) ≈ 1.1547, sec(120°) ≈ -2 and cot(120°) ≈ -0.5774.
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