Question

The cosine function is an even function.

True or false (please explain)

Answer 1

I am thinking it is true?

Answer 2

cos(-x)= cos(x)

Answer 3

cos(-u)= cos(u) Even

Answer 4

yes cos is an even function just for info sin and tan are odd

Answer 5

sin(-u)= -sin(u) Odd
cos(-u)= cos(u) Even
tan(-u)= -tan(u) Odd
sec(-u)= sec(u) Even
csc(-u)= -csc(u) Odd
cot(-u)= -cot(u) Odd
where u=any real number