If `sin80+sin50= 2sinA.cosB` then `A and B` is

Statement I: If sinA=sinB , cosA=cosB then A= 2np + B Statement II :If A+B+C=90^@ then sin2A+sin2B + sin2C = 4 sinA sinB sinC Which of the above statements is correct?

If sinA/sinB=sin(A-C)/sin(C-B) then

If sin2A=2sinA then A=

If sinA=sinB and cosA=cosB , then prove that sin. (A-B)/(2)=0 .

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

In a tringle ABC, sin A-cosB=cosC, then angle B, is

If sinA+sinB=C,cosA+cosB=D , then the value of sin(A+B) =

If sinA=3/5 and cosB =-12/15 , where A and B both lie in second quadrant, then find the value of sin(A+B).

If sinA+sinB=a and cosA+cosB=b then prove that sin(A+B)=(2ab)/(a^2+b^2) and cos(A+B)=(b^2-a^2)/(a^2+b^2)

If sinA = 1/2 and cosB = 1/2 then find the value of A + B.