Let & be continuous in [a,b] and differentiable in (a,b). It's true that: a) f (a) = f(b) = 3 x € (a,b) such that the tangent line to the graph of at (nor f(no)) is horizontal. b) there exists - (b) c) f(a) > f (b) f is decreasing in (a,b) d) fla) 0, \₂ € (a, b)

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