Question

How do you use a calculator to approximate `arccos(-0.41)`?

Answer 1

Use `cos^-1(-0.41)`

Explanation:

`arccos` and `cos^-1` are equivalent and most calculators have `cos^-1`
`cos^-1(-0.41)=1.99325038...`or in degrees `114.20483...`
Make sure to round to whatever your assignment requires.