AM-2572

Addition formulae

A Math · Secondary 4 · Easy · Addition formulae

Simplify

\cos 15^\circ

without using a calculator, giving your answer in surd form.

$\dfrac{\sqrt6+\sqrt2}{4}$
$\dfrac{\sqrt6-\sqrt2}{4}$
$\dfrac{\sqrt3}{2}$
$\dfrac{\sqrt2}{2}$

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