Asked by Unknown

1. Under what conditions is the tangent to f(x) to the point (a,f(a)) horizontal?
A.f'(a) > 0
B.f'(a)=0
C.f'(a) < 0
D. f'(a) is undefined
Answered by Bosnian
The derivative is zero where the function has a horizontal tangent.

f ' (a) = 0
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