How do you write equations for three vertical asymptotes of the function y=secX

x = 90, x = -90, x = 270.

Step-by-step explanation:

If we use degrees on the x-axis  one asymptote will be x = 90 as the secant of 90 degrees is undefined  ( sec 90 = 1/cos 90 = 1/0).

There will be further asymptotes  at 90 +/- 180  degrees.

Step-by-step explanation:

The question is properly presented in the attachment.

Given

Required

Solve for x and  

From the attachment and are vertically opposite.

This means that:

=

Substitute values for and

Collect Like Terms

Make x the subject

Substitute 18 for x in