Question

MEDAL!!!!!!!!!!!



Which function has a domain of all real numbers?

A. y=sin x

B. y=sec x

C. y=tan x

D. y=cot x

Answer 1

B

Answer 2

it was A

Answer 3

oops

Answer 4

why in the world would it be y=secx that has asymptotes like everywhere

Answer 5

sinx

sec x = 1/cosx

tan x = sinx/cosx

cot x = 1/tan x

As you can see, with sin(x), x can be all real numbers. But in the other answers there are restrictions, eg. cosx cannot equal 0 so it is not all real numbers