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.