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

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

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

In a /_ABC/_A=(pi)/(2) then cos^(2)B+cos^(2)C=

If A+B+C=(3 pi)/(2), then cos2A+cos2B+cos2C is equal to (A)1-4cos A cos B cos C(B)4sin A sin B sin C(C)1+42cos A cos B cos C(D)1-4sin A sin B sin C

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

If in a Delta ABC,/_B=(2 pi)/(3) then cos A+cos C lie in

If in Delta ABC,/_B=2(pi)/(3), then cos A+cos C lie in

If A+B+C=pi then sin(A+B)+cos(A+C)=