Write the value of cos 1° cos 2° ... cos 180°.
Consider cos 1° cos 2° cos 3° ... cos 180°
= cos 1° cos 2° cos 3° …× cos 90° × … × cos 180°
= cos 1° cos 2° cos 3° ... × 0 × … × cos 180°
= 0 (∵ cos 90° = 0)
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