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Differentiate rational functions

AP.CALC: FUN‑3 (EU), FUN‑3.B (LO), FUN‑3.B.2 (EK)
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Problem

Let y, equals, start fraction, x, squared, minus, 7, x, plus, 2, divided by, x, minus, 2, end fraction.
What is the value of start fraction, d, y, divided by, d, x, end fraction at x, equals, 4 ?
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