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) $- \frac { 1 } { 3 }$

Question

Quizplus · Accepted Answer

The secant function is the reciprocal of the cosine function, so $\sec \theta = -4$ implies $\cos \theta = -\frac{1}{4}$.

Use the Appropriate Identity to Find the Indicated Function Value cos⁡θ\cos \thetacosθ

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