" Which of the following is an even function "

Which of the following is not an even function?

A function is said to be even if f(x)=f(-x). Which of the following is not an even function?

If f(x)=cosx and g(x)=2x+1 , which of the following are even functions? I. f(x)*g(x) II f(g(x)) III. g(f(x))

Which of the following function is even function

Which of the following function is an even function ?

Which of the following function is an even function ?