cos 1∘ × cos 2∘ × cos 3∘ ×……..× cos 180∘ is equal to _

1.	cos 1∘ × cos 2∘ × cos 3∘ ×……..× cos 180∘ is equal to ____.
Answer» cos $1^{\circ}$ $\times$ cos $2^{\circ}$ $\times$ cos $3^{\circ}$ $\times$ …….. $\times$ cos $180^{\circ}$ is equal to ____.

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