Odd, Even or Neither

Question

The function  𝑓(𝑥)=cos(𝑒^x+𝑒^-x)+𝑥²  is ...

Group of answer choices

1. odd.
2. even.
3. neither even nor odd.
4. both even and odd.
5. an exponential function.

Answer 1

Since the function satisfies f(x)=f(-x) the function is even.