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Evaluate : $\frac{\cos 45^\circ}{\tan 30^\circ + \sin 60^\circ}$
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$\frac{\frac{1}{\sqrt{2}}}{\frac{1}{\sqrt{3}} + \frac{\sqrt{3}}{2}}$ ($1\frac{1}{2}$ marks)
$= \frac{2\sqrt{3}}{5\sqrt{2}} \text{ or } \frac{\sqrt{6}}{5}$ ($\frac{1}{2}$ mark)
$= \frac{2\sqrt{3}}{5\sqrt{2}} \text{ or } \frac{\sqrt{6}}{5}$ ($\frac{1}{2}$ mark)