若f(x)是周期函数,则f'(x)必是周期函数?

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若f(x)是周期函数,则f''(x)必是周期函数?若f(x)是周期函数,则f''(x)必是周期函数?若f(x)是周期函数,则f''(x)必是周期函数?f(x+T)=f(x)f''(x+T)=f''(x)f''(x

若f(x)是周期函数,则f'(x)必是周期函数?
若f(x)是周期函数,则f'(x)必是周期函数?

若f(x)是周期函数,则f'(x)必是周期函数?
f(x+T)=f(x)
f'(x+T)=f'(x)
f'(x)为周期函数,周期也为T.