| p{6cm}} (2) $\dfrac{2k\pi}{5}$ | (1) $\dfrac{k\pi}{5}$ |
| [18pt] (4) $\dfrac{1}{5}(2k+1)\pi$ | (3) $\dfrac{3k\pi}{5}$ |
\textbf{109-} What is the general solution of the trigonometric equation $\cot x = \dfrac{\sin x + \sin 2x}{\cos x + \cos 2x}$?
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\begin{tabular}{p{6cm} p{6cm}}
(2) $\dfrac{2k\pi}{5}$ & (1) $\dfrac{k\pi}{5}$ \\[18pt]
(4) $\dfrac{1}{5}(2k+1)\pi$ & (3) $\dfrac{3k\pi}{5}$
\end{tabular}
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