Daniel B. answered 12/19/20
Tutor
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(204)
A retired computer professional to teach math, physics
f'(4)
= lim x-> 4 (f(x)-f(4))/(x-4)
= lim x-> 4 (3 - 3)/(x-4)
= lim x-> 4 0 /(x-4)
= lim x-> 4 0
= 0