Question

How do you evaluate `cos^-1(cos((5pi)/6))`?

Answer 1

`(5pi)/6`

Explanation:

The `cos^-1x` is the inverse function of cosx

and `color(red)(|bar(ul(color(white)(a/a)color(black)(cos^-1(cosx)=x)color(white)(a/a)|))`

`rArrcos^-1(cos((5pi)/6))=(5pi)/6`