Answer:
x = n*pi where n is some integer, just pick three integers.
Step-by-step explanation:
Vertical asymptotes are vertical, so to write the equation of a vertical line, much like a horizontal is y = a, a vertical line is x=b. So you just need to find where the vertical asymptotes are.
sec(x) is 1/cos(x). the VAs occure when cos(x) is 0? well, when does it equal 0? Basically at 0 then every pi along the x axis positive or negative afterwards. so basically n*pi where n is some integer, so that's negatves, 0 and positives. just choose three integers.
EDIT
I was wrong. cos(x) is 0 when x = pi*n + pi/2 Or in other words n*pi/2 where n is an odd integer. I mistakenly explained when sin(x) = 0.
