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Trigonometry
Question

Use the unit circle, along with the definitions of...

Use the unit circle, along with the definitions of the circular functions, to find the exact values for the given functions when 

\(s = - \frac { \pi } { 2 }\) . Select the correct choice below and fill in any answer boxes in your choice. A. \(\sin ( - \frac { \pi } { 2 } ) = \) 

(Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression.) 

B. The solution is undefined. 

Answer

A. -1

Solution
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