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Question

The value of $cos 60^{\circ} cos 30^{\circ} - sin 60^{\circ} sin 30^{\circ}$
1
2
0
-1

A

0

B

1

C

2

D

-1

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Solution

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$cos 30^{\circ} \cdot cos 60^{\circ} - sin 60^{\circ} \cdot sin 30^{\circ} = 0$

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