In Exercises the curve y = ∫(x) has a vertical tangent at x = a if

In each case, the right- and left-hand limits are required to be the same: both + ∞ or both - ∞. Use graphs to investigate whether the curve has a vertical tangent at x = 0.

y = x^l/3

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or if f(a+h)-f(a) h f(a+h)-f(a) h lim h→0 lim h→0 <=0