Find the value of $\sec \left[\arccos \left(\frac{-1}{2}\right)\right]$.
A) 2
B) $\frac{2}{\sqrt{3}}$
C) -2
D) $\frac{-2}{\sqrt{3}}$

Name: Find the value of $\sec \left[\arccos \left(\frac{-1}{2}\right)\right]$. A) 2 B) $\frac{2}{\sqrt{3}}$ C) -2 D) $\frac{-2}{\sqrt{3}}$
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Quizplus · Accepted Answer

The angle whose cosine is $-\frac{1}{2}$ is $120^\circ$ or $\frac{2\pi}{3}$ radians. The secant of this angle is the reciprocal of the cosine, which is $-2$.

Find the Value Of sec⁡[arccos⁡(−12)]\sec \left[\arccos \left(\frac{-1}{2}\right)\right]sec[arccos(2−1​)] A) 2 B) 23\frac{2}{\sqrt{3}}3​2​

Find the Value Of $\sec \left[\arccos \left(\frac{-1}{2}\right)\right]$
A) 2
B) $\frac{2}{\sqrt{3}}$