match the trig expression (sec (x) cos(x)) with one of the following: -1, cos x, cot x, 1, -tan x, sin x.?

Question

in this problem, the question only states to match the trigonometric question with the answer that is right.. I don't know which is the right answer and how to get the right answer. the expression: (sec (x) cos (x)) matches with which answer? A) -1 B) cos x C) cot x D) 1 E) -tan x F) sin x

Answer 1

sec, by definition, is 1/cos.

What's the product of 1/cos and cos?

Yes, it's that simple. :)