Answer
$\color{blue}{\approx 1.3 \text{ radians}
\\\approx 5 \text{ radians}}$
Work Step by Step
To approximate the angle whose cosine value is $0.3$, look up in the given figure the angle/s directly above and directly below $x=0.7$
These angles are approximately $1.3$ radians and $5$ radians
Thus, the angles are approximately:
$\color{blue}{1.3 \text{ radians}
\\5 \text{ radians}}$
