Question

How do you solve and find the value of `cos^-1(1/2)`?

Answer 1

Refer to Explanation

Explanation:

`cos^-1(1/2) = 60^@`

Trigonometric Ratios of Special Angles:

Answer 2

`pi/3; (5pi)/3`
`60^@; 300^@`

Explanation:

`cos x= 1/2`
Trig table gives -->
`x = pi/3`, or `x = 60^@`
Unit circle gives another arc (angle) that has the same cos value (1/2) -->
`x = - pi/3`, or `x = - 60^@`,
or `x = (5pi)/3` (co-terminal to `- pi/3`)