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Using linear approximation techniques, approximate $\tan\left(\dfrac{7\pi}{18}\right)$.

$\dfrac{2\pi}{9}+\sqrt{3}$

$\dfrac{4\pi}{9}+\dfrac{\sqrt{3}}{2}$

$\dfrac{\pi}{3}+\dfrac{\sqrt{3}}{3}$

$\dfrac{\pi}{4}+\sqrt{2}$