kuvitia9f

2021-12-26

What is ${\mathrm{cos}}^{-1}\left(\frac{1}{2}\right)$ ?

Lindsey Gamble

Beginner2021-12-27Added 38 answers

Explanation:

$\mathrm{arccos}x=\frac{1}{2}$

Trig table of special arcs gives

$\mathrm{cos}x=\frac{1}{2}\to x=\frac{\pi}{3}$

Trig unit circle gives another arc x that has the same$\mathrm{cos}$ value

$\mathrm{cos}x=\frac{12}{\to}x=-\frac{\pi}{3}$ , or $x=\frac{5\pi}{3}$ (co-terminal)

Answers:$\frac{\pi}{3}$ and $\frac{5\pi}{3}$

Trig table of special arcs gives

Trig unit circle gives another arc x that has the same

Answers: