AM-2742

Addition formulae

A Math · Secondary 4 · Medium · Addition formulae

Using the identity for

\cos(A+B)

, find the exact value of

\cos 75^\circ

.

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

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