$$\text { Find all values of } \theta \text {, if } \theta \text { is in the interval } \left[ 0,360 ^ { \circ } \right) \text { and has the given function value. }$$
-$\cos \theta = \frac { 1 } { 2 }$
A) $60 ^ { \circ }$ and $120 ^ { \circ }$
B) $60 ^ { \circ }$ and $300 ^ { \circ }$
C) $150 ^ { \circ }$ and $210 ^ { \circ }$
D) $210 ^ { \circ }$ and $330 ^ { \circ }$

Question

Quizplus · Accepted Answer

The cosine function equals $1/2$ at $60^\circ$ and $300^\circ$ within the interval $[0,360^\circ)$, corresponding to the first and fourth quadrants where cosine is positive.

- cos⁡θ=12\cos \theta = \frac { 1 } { 2 }cosθ=21​

- $\cos \theta = \frac { 1 } { 2 }$