$c o s 1^{o} c o s 2^{o} c o s 3^{o} . . . . . . . . . . . . . . . c o s 90^{o}$

0

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Solution

The correct option is A $0$
$c o s 1^{o} c o s 2^{o} c o s 3^{o} . . . . . . . . . . . . . . . . c o s 90^{o}$
$= c o s 1^{o} c o s 2^{o} . . . . . . . . . . . \times 0$ (because $c o s 90^{o} = 0)$
$= 0$

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x

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