Answer
$$\int^{\pi/3}_{0}\sec^2\theta d\theta=\sqrt3$$
Work Step by Step
$$A=\int^{\pi/3}_{0}\sec^2\theta d\theta$$ $$A=\tan\theta\Big]^{\pi/3}_{0}$$ $$A=\tan\frac{\pi}{3}-\tan0$$ $$A=\sqrt3-0$$ $$A=\sqrt3$$
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