109- The value of $\dfrac{1}{\sin 15°} - \dfrac{1}{\cos 15°}$ is which of the following? (1) $2$ (2) $\sqrt{6}$ (3) $2\sqrt{2}$ (4) $2\sqrt{3}$
\textbf{109-} The value of $\dfrac{1}{\sin 15°} - \dfrac{1}{\cos 15°}$ is which of the following?
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(1) $2$ \hfill (2) $\sqrt{6}$ \hfill (3) $2\sqrt{2}$ \hfill (4) $2\sqrt{3}$
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