lf `A + B+ C=pi` then `cos(B/2)+cos(C/2)` equals

If A+B+C=pi then cos((B)/(2))+cos((C)/(2)) equals

If A+B+C=pi , then cos B+cos C=

If A+ B + C = pi, then cos^(2) A + cos ^(2) B + cos ^(2) C is equal to : A) 1 - cos A cos B cos C B) 1 - 2 cos A cos B cos C C) 2 cos A cos B cos C D) 1 + cos A cos B cos C

If A+B+C=pi , then cos^(2)A+cos^(2)B+cos^(2)C is equal to

If A + B + C = pi , then what is cos(A + B) + cos C equal to ?

If A+B+C=pi , then cos 2A+cos 2B+cos 2C=

If A+B+C=pi then prove cos( (A)/2) cos( (B-C)/2) + cos( B/2) cos((C-A)/2) + cos( C/2) cos( (A-B)/2) = sinA +sinB+sinC

If A+B+C=pi , then cos2A+cos2B+cos2C=

If A+B+C=pi , then cos2A+cos2B+cos2C=?

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