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Area bounded by polar curves

AP.CALC: CHA‑5 (EU), CHA‑5.D (LO), CHA‑5.D.1 (EK), CHA‑5.D.2 (EK)

Problem

Let R be the region in the first and second quadrants enclosed by the polar curve r, left parenthesis, theta, right parenthesis, equals, sine, squared, left parenthesis, theta, right parenthesis, as shown in the graph.
Which integral represents the area of R?
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