Polar coordinates

Sketching r = a(1 + cos θ) style curves, converting forms, and finding areas.

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Q1Direct calculation5 marks
The curve CC has polar equation r=2acos⁡θr=2a\cos\theta for −π2≤θ≤π2-\frac{\pi}{2}\le\theta\le\frac{\pi}{2}. Find the area of the region enclosed by CC.

Coach · attempt

Write something first. A wrong start still earns method marks later.