AM-2586

Addition formulae

A Math · Secondary 4 · Hard · Addition formulae

Solve the equation

\tan 75^\circ = \dfrac{1-\tan 15^\circ}{1+\tan 15^\circ}

for

\tan 15^\circ

.

$2 - \sqrt3$
$2 + \sqrt3$
$-\dfrac{\sqrt3}{3}$
$\dfrac{1}{2+\sqrt3}$

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