If f(x) is even and f '(4) = 3, what is f '(-4)

How do you evaluate this if all you know is that it is even?

What about for odd functions for ex:
If g(x) is an odd function and g '(2) = 3, what is g '(-2)?

Hello,

If f is even and f'(4)=3 then f'(-4)=-3
If g is odd and f'(2)=3 then g'(-2)=3

Regards,
Dragon.Jade :-)