Find the exact value of the expression.
-$\sec 240 ^ { \circ }$
A) $- 2$
B) $- \frac { 2 \sqrt { 3 } } { 3 }$
C) $\frac { 2 \sqrt { 3 } } { 3 }$
D) 2

Name: Find the exact value of the expression. -$\sec 240 ^ { \circ }$ A) $- 2$ B) $- \frac { 2 \sqrt { 3 } } { 3 }$ C) $\frac { 2 \sqrt { 3 } } { 3 }$ D) 2
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Question

Quizplus · Accepted Answer

$\sec 240^\circ = \frac{1}{\cos 240^\circ}$. Since $\cos 240^\circ = -\frac{1}{2}$ (in the third quadrant where cosine is negative), $\sec 240^\circ = \frac{1}{-\frac{1}{2}} = -2$.

Find the Exact Value of the Expression sec⁡240∘\sec 240 ^ { \circ }sec240∘

Find the Exact Value of the Expression $\sec 240 ^ { \circ }$