TRIGONOMETRIC FUNCTIONS Evaluating (Page 5 of 15)

To evaluate the cosecant, secant and cotangent functions, we again 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. 7 2nd Pi key. Divide key. 6 Right parenthesis key. x to the -1 key. ENTER key.
 COS key. 7 2nd Pi key. Divide key. 6 Right parenthesis key. x to the -1 key. ENTER key.
 TAN key. 7 2nd Pi key. Divide key. 6 Right parenthesis key. x to the -1 key. ENTER key.		 Calculator screen image.

Thus, csc(7π/6) ≈ -2, sec(7π/6) ≈ -1.1547 and cot(7π/6) ≈ 1.7321.
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