(1)F(x)=x²+bsinx
âµF(x-5)=F(5-x)
â´(x-5)²+bsin(x-5)=(5-x)²+bsin(5-x)
â´2bsin(x-5)=0ææç«ï¼
â´b=0
â´f(x)=x²-2
(2)h(x)=ln(1+x²)-1/2·x²+1-k
h'(x)=2x/(1+x²)-x
=x(1-x²)/(1+x²)
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