First slide

Multiple and sub- multiple Angles

Question

If $\cos x - \frac{\cot β \sin x}{2} = \frac{\sqrt{3}}{2},$ then $\tan \frac{x}{2} =$

Moderate

A

$\tan \frac{β}{2} \tan 15 °$
B

$\tan \frac{β}{2}$
C

$\tan 15 °$
D

$2 + \sqrt{3}$

Solution

Write $\cos x$ and $\sin x$ in terms of $\tan \frac{x}{2}$

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