Let D be the triangle in the xy plane with vertices at (-2, 1), (1, 0), and (3, 4). Describe the boundary aD as a piecewise smooth curve, oriented counterclockwise. (Use t as a parameter. Begin the curve at point (-2, 1).) f(t) = , te [0, 1) , te [1, 2) te [2, 3)

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