Question: Find dy/dx and d2y/dx2 for which values of is the curve concave upward? (a) x = t2 + 1, y = t 2 + t

Find dy/dx and d2y/dx2 for which values of is the curve concave upward?
(a) x = t2 + 1, y = t 2 + t
(b) x = et , y = te-t

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