LON-CAPA trig_eq001.problem

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$\textrm{What is the period of the function } \ y \; = \; \tan \left( \frac{ x}{2} \right) \textrm{ ?}$

$\frac {{}\pi}{2}$

$\pi$

$\frac {{}\pi}{4}$

${2}\pi$

${4}\pi$

$\textrm{None of the above}$

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