Question

How do you solve `4cos(x/5)=-3`?

Answer 1

`x=693`

Explanation:

`4cos(x/5)=-3`
or

`cos(x/5)=-3/4`
or

`x/5=cos^-1(-3/4)`
or

`x/5=138.6`
or

`x=5times138.6`
or

`x=693`