AM-2653

Addition formulae

A Math · Secondary 4 · Medium · Addition formulae

Without using a calculator, find the exact value of

\cos 15^{\circ}

.

$\dfrac{\sqrt{6} + \sqrt{2}}{4}$
$\dfrac{\sqrt{6} - \sqrt{2}}{4}$
$\dfrac{\sqrt{3} + 1}{2}$
$\dfrac{\sqrt{3} - 1}{2}$

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