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Given parametric equations below, find d^2y/dx^2 and determine the intervals on which the graph of the...

Given parametric equations below, find d^2y/dx^2 and determine the intervals on which the graph of the curve is concave up or concave down.

(a) x = t^2 , y = t^3−3t

(b) x = cos(t), y = sin(2t)

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