$c o s 60^{\circ} c o s 30^{\circ} - s i n 60^{\circ} s i n 30^{\circ}$

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Solution

$c o s 60^{\circ} c o s 30^{\circ} - s i n 60^{\circ} s i n 30^{\circ}$
$c o s (A + B) = c o s A c o s B - s i n A s i n B$

$c o s (60 + 30) = c o s 90 = 0$

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