Use a calculator to evaluate the trigonometric function. Round your answer to four decimal places. (Be sure the calculator is set in the correct angle mode.) $\sec 230 ^ { \circ }$
A) $\sec 230 ^ { \circ } \approx - 0.0222$
B) $\sec 230 ^ { \circ } \approx 0.9778$
C) $\sec 230 ^ { \circ } \approx - 0.9778$
D) $\sec 230 ^ { \circ } \approx - 1.5557$
E) $\sec 230 ^ { \circ } \approx - 0.5557$

Question

Quizplus · Accepted Answer

The secant function is the reciprocal of the cosine function. To find $\sec 230^\circ$, first find $\cos 230^\circ$ and then take its reciprocal. Using a calculator set to degrees, $\cos 230^\circ \approx -0.6428$, so $\sec 230^\circ = \frac{1}{\cos 230^\circ} \approx \frac{1}{-0.6428} \approx -1.5557$.

Use a Calculator to Evaluate the Trigonometric Function sec⁡230∘\sec 230 ^ { \circ }sec230∘

Use a Calculator to Evaluate the Trigonometric Function $\sec 230 ^ { \circ }$