Question

Which of the following describes the domain of y = sec x, where n is any integer?

Answer 1

A. x ≠ 2nπ
B. x ≠ nπ
C. x ≠ (π/2) + nπ
D. x ≠ (nπ)/2

Answer 2

so, when does sec x yield a number with a 0 in the denominator ?
that angle will be excluded from the domain...

Answer 3

or in other words, since cos x = 1/ sec x,
when will cos x = 0 ?

Answer 4

C. x ≠ (π/2) + nπ

Answer 5

Right? Or am I missing something...

Answer 6

if you are unsure, plug in n=1,2,3....to see whether those angles make cos x= 0 or sec x = something/0 ...

Answer 7

to save your time, let me tell you that you are correct :)

Answer 8

HA! Okay, thanks... AGAIN!

Answer 9

welcome ...AGAIN! ^_^