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Questions  >>  Olympiad-Math  >>  Class 10
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Q)

The value of $\cos ^{\circ} \cos 2^{\circ} \cos 3^{\circ}...... \cos 179^{\circ} \cos 180^{\circ}$

$\begin{array}{1 1}(A) \;1 \\(B)\;-1 \\(C)\;0 \\(D)\;\infty \end{array}$

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