According to the properties of odd function, f(x) is monotonic in a single period, and f' (1) >: 0, which is judged as monotonic increasing function.
Periodic function f(5)=f(-5)=f(0)=0.
The derivative function of a periodic function is also a periodic function.
f '(-5)= f '( 1) =f '(0)>0;
F '(x)= f '(-x), and f' (x) is an even function (in a single period).
F ''(x) =-f ''(-x), f'' (x) is odd function (in a single period), and f ''(-5) = f ''(0) =0.
So f (5) = f'' (-5) < F'(-5), answer B.
For example, the periodic function f(x)=tan(x),-1/2.
f(0)=0,f '(0)= 1,f ''(0) =0
Primary school mathematics multiplication and division teaching plan 1
Teaching objectives
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