If `sinA sinB sinC+cosAcosB=1,` then the value of sinC is

If sinA+sinB+sinC=3 , then the value of cosA+cosB+cosC is equal to

In a triangleABC , If tan A: tan B : tan C = 3:4:5, then the value of sinA.sinB.sinC is equal to:

In a triangle ABC, the value of sinA+sinB+sinC is

In triangle ABC , if AB=2,BC=4 and AC=5, then the value of (sinA-sinB)/(sinC) is equal to

In a Delta ABC , if tan A : tan B : tan C = 3 : 4 : 5, then the value of sinA.sinB.sinC is equal to

If a DeltaABC , the value of sinA+sinB+sinC is

If (1+sinA)( 1+sinB)(1+sinC) = (1-sinA)(1-sinB)(1-sinC), then prove that the value of each side = +-cos A cosB cosC ,

If any DeltaABC, if sinA,sinB,sinC are in A.P. and the maximum value of tan(B/2)=lambda, then 1/lambda^2 is -