AM-2544

Addition formulae

A Math · Secondary 4 · Medium · Addition formulae

Using your result for

\sin 15^\circ

, find

\sin^2 15^\circ

in the form

a - b\sqrt3

, where

a

and

b

are rational numbers.

$\dfrac12-\dfrac{\sqrt3}{4}$
$\dfrac12+\dfrac{\sqrt3}{4}$
$1-\dfrac{\sqrt3}{2}$
$\dfrac{3-\sqrt3}{4}$

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