Answer
$=4\sqrt 3-\frac{4}{3}\pi$
Work Step by Step
$A=4\times \int_{0}^{\pi/6}\frac{1}{2}(8cos(2\theta)-4)d \theta$
$=2[4sin(2\theta)-4\theta]_{0}^{\pi/6}$
$=4\sqrt 3-\frac{4}{3}\pi$
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