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Second derivatives (parametric functions)

AP.CALC: CHA‑3 (EU), CHA‑3.G (LO), CHA‑3.G.3 (EK)

Problem

A curve is defined by the parametric equations x, equals, t, squared, minus, 16 and y, equals, t, start superscript, 4, end superscript, plus, 3, t.
What is start fraction, d, squared, y, divided by, d, x, squared, end fraction in terms of t ?
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