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Trigonometry
Question

Evaluating Sine, Cosine, and Tangent In Exercises 13-22, evaluate (if possible) the sine, cosine, and tangent at the real number. 13. $$t = \frac { \pi } { 4 }$$

15. $$t = - \frac { \pi } { 6 }$$

13)$$\sin ( \frac { \pi } { 4 } ) = \frac { \sqrt { 2 } } { 2 }$$

$$\cos ( \frac { \pi } { 4 } ) = \frac { \sqrt { 2 } } { 2 }$$

$$\tan ( \frac { \pi } { 4 } ) = 1$$

15)$$\sin ( - \frac { \pi } { 6 } ) = - \frac { 1 } { 2 }$$

$$\cos ( - \frac { \pi } { 6 } ) = \frac { \sqrt { 3 } } { 2 }$$

$$\tan ( - \frac { \pi } { 6 } ) = - \frac { \sqrt { 3 } } { 3 }$$

Solution
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