Question

Which equation should be used to graph y=sec^-1(x) on a calculator?

Answer 1

`y=1/cos^-1(x)`

Explanation:

`y=sec^-1(x)`

`y=1/cos^-1(x)=cos^-1(1/x)`

`1/cos^-1(x)!=cosx`

`cos^-1x` is the arccosine of `x` it is NOT the same as the inverse of the `cosx`.