Which equation should be used to graph y is equal to secant inverse of x on a calculator?

The inverse secant function is defined by taking the inverse cosine of the reciprocal: sec⁻¹(x) = cos⁻¹(1/x). So to graph y = sec⁻¹(x) on a calculator, enter y = cos⁻¹(1/x), which is choice C. Choice A instead takes the reciprocal of cos⁻¹(x), which is a different function.

AI-written and checked against the verified answer.