极限问题…如图…给个过程
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lim(x->a) [f(x)-b]/(x-a) = A (0/0)
=>
f(a) -b=0
f(a)=b
lim(x->a) [f(x)-b]/(x-a) = A (0/0)
lim(x->a) f'(x)= A
=> f'(a) = A
------------
lim(x->a) [e^[f(x)]-e^b]/(x-a) (0/0)
=lim(x->a) f'(x) e^[f(x)]
=f'(a) e^(f(a))
=A.e^b
=>
f(a) -b=0
f(a)=b
lim(x->a) [f(x)-b]/(x-a) = A (0/0)
lim(x->a) f'(x)= A
=> f'(a) = A
------------
lim(x->a) [e^[f(x)]-e^b]/(x-a) (0/0)
=lim(x->a) f'(x) e^[f(x)]
=f'(a) e^(f(a))
=A.e^b
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