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Differentiate polar functions

AP.CALC: FUN‑3 (EU), FUN‑3.G (LO), FUN‑3.G.1 (EK), FUN‑3.G.2 (EK)

Problem

Let r be the polar function r, left parenthesis, theta, right parenthesis, equals, 5, theta, minus, 1.
What is the rate of change of the y-coordinate with respect to theta at the point where theta, equals, pi?
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