For which of the following functions is f(w) = f(−w) for all values of w ?	Pick one
A) f(x) = x^3 + 3  B) f(x) = −x  C) f(x) = 2x + 3  D) f(w) = −w^2 + 2  E) f(x) = 5x − 4
f(w) = f(−w)   The above is a property of an even function .   f(w) = f^(n)   f(w) = f(−w) will hold when n is an even integer .   The only case when w is even is option f(w) = −w^2 + 2   Answer f(w) = −w^2 + 2
<result>D</result>
For which of the following functions is f(w) = f(−w) for all values of w ?