Evaluate:
$cos 1^{o} cos 2^{o} cos 3^{o} . . . . . . . cos 180^{o}$

- 1

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Solution

The correct option is C $0$
$cos 1^{o} . cos 2^{o} . cos 3^{o} . . . . . . . . . . cos 180^{o} = cos 1^{o} \times cos 2^{o} \times cos 3^{o} \times . . . cos 90^{o} \times . . . . . . . . . . cos 180^{o} = cos 1^{o} \times cos 2^{o} \times cos 3^{o} \times . . . \times 0 \times . . . . . . . . . cos 180^{o} = 0$

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