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$A+B=C=> \cos ^2 A +\cos ^2 B+\cos ^2 C- 2 \cos A \cos B \cos C $ is equal to :

\[\begin {array} {1 1} (a)\;1 & \quad (b)\;2 \\ (c)\;0 & \quad (d)\;3 \end {array}\]

1 Answer

(a) 1
answered Feb 27, 2014 by meena.p
 
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