[微積] 連題目都霧煞煞...
Recall that a function f is called even if f(-x)=f(x) for all x in its
domain and odd if f(-x)=-f(x) for all such x. Prove each of the following.
(a) The derivative of an even function is an odd function.
(b) The derivative of an odd function is an even function.
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