Find the Exact Value of the Indicated Trigonometric Function of θ

question 218

Multiple Choice

Find the exact value of the indicated trigonometric function of θ.
- $\tan \theta = - \frac { 21 } { 20 } , \quad 270 ^ { \circ } < \theta < 360 ^ { \circ } \quad$ Find $\cos \theta$

• A) \(- \frac { 15 } { 17 }\)
• B) \(\frac { - 21 \sqrt { 41 } } { 41 }\)
• C) \(- 15\)
• D) \(\frac { 20 \sqrt { 41 } } { 41 }\)

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