$Write the value of \cos 1 ° \cos 2 ° . . . \cos 180 ° .$

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Solution

$\cos 1 ° \cos 2 ° . . . \cos 180 ° = \cos 1 ° \cos 2 ° . . . \cos 90 ° . . . \cos 180 ° = \cos 1 ° \cos 2 ° . . . 0 . . . \cos 180 ° = 0$

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