Use the Appropriate Identity to Find the Indicated Function Value $\cos \theta$

Use the appropriate identity to find the indicated function value. Rationalize the denominator, if applicable. If the given
value is a decimal, round your answer to three decimal places.
- $\cos \theta$ , given that $\sec \theta = - 4$

A) $\frac { 1 } { 4 }$
B) $\frac { 1 } { 3 }$
C) $- \frac { 1 } { 4 }$
D) $- \frac { 1 } { 3 }$

Correct Answer:

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