If sinA = sinBandcosA=cosA=cosB, then which one of the following is correct ?

If sinA = sinB and cosA=cosB, then which one of the following is correct ?

If sinA=sinBandcosA=cosB then

Three expressions are given below : Q_(1)=sin(A+B)+sin(B+C)+sin(C+A) Q_(2)=cos(A-B)+cos(B-C)+cos(C-A) Q_(3)=sinA(cosB+cosC)+sinB(cosC+cosA)+sinC(cosA+cosB) Which one the following is correct ?

If sinA+sinB=l and cosA-cosA-cosB=m , then cos(A-B)=

If sinA+sinB=a and cosA+cosB=b,then cos(A+B)

If sinA+sinB=a and cosA+cosB=b,then cos(A+B)

If sinA=sin B and cosA=cosB , then find the value of A in terms of Bdot

If sinA=sin B and cosA=cosB , then find the value of A in terms of Bdot

If sinA=sinB,cosA=cosB , then the value of A in terms of B is