" If "A+B+C=(3 pi)/(2)" then "cos2A+cos2B+cos2C" is equal to "

If A+B+C =(3pi)/(2) , then cos2A+cos2B+cos2C is equal to-

If A+B+C=(3pi)/(2) , then cos2A+cos2B+cos2C=

If A+B+C=(3pi)/(2) , then cos2A+cos2B+cos2C=?

If A+B+C = (3pi)/(2),then cos2A+cos2B+cos2C=

If A+B+C=(3pi)/2 , then cos2A +cos2B+cos2C is

If A+B+C=3pi/2 . Then cos 2A +cos 2B+cos2C is equal to

If A+B+C=(3pi)/2 . Then cos 2A +cos 2B+cos2C is equal to ................. A) 1-4 cos A cos B cos C B) 4 sin A sin B sin C C) 1+2 cos A cos B cos C D) 1-4 sin A sin B sin C