\[\cos 1{}^\circ .\cos 2{}^\circ .\cos 3{}^\circ .........\cos 179{}^\circ =\] [Karnataka CET 1999; DCE 2005]

\[\cos 1{}^\circ .\cos 2{}^\circ .\cos 3{}^\circ .........\cos 179{}^\

1.	\[\cos 1{}^\circ .\cos 2{}^\circ .\cos 3{}^\circ .........\cos 179{}^\circ =\] [Karnataka CET 1999; DCE 2005]
A.	0
B.	1
C.	2
D.	\[\frac{1}{2}\]
Answer» B. 1

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\[\cos 1{}^\circ .\cos 2{}^\circ .\cos 3{}^\circ .........\cos 179{}^\circ =\] [Karnataka CET 1999; DCE 2005]

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