求极限的题目
1个回答
展开全部
f(0+) =f(0)= lim(x->0) x^2.g(x) =0
f(0-) =lim(x->0) (1-cosx)/√x =0
=> f(0+)=f(0-)=f(0)
x=0 , f(x) 连续
f'(0+)
= lim(h->0) h^2.g(h) /h
= lim(h->0) hg(h)
=0
f'(0-)
=lim(h->0) [(1-cosh)/√h ]/h
=lim(h->0) (1-cosh)/h^(3/2)
=0
f'(0+)=f'(0-)
ans : D 可导
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