The value of $cos1^{0} cos2^{0} cos3^{0}............. cos177^{0} cos178^{0} cos179^{0}$ is :

The value of $cos1^{0} cos2^{0} cos3^{0}............. cos177^{0} cos178^{0} cos179^{0}$ is :
1). 0
2). $\frac{1}{2}$
3). 1
4). $\frac{1}{\sqrt{2}}$

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