If sinx+siny=a and cos x+cosy =b then value of sin(x+y) =

If sinx + siny =a and cos x +cos y =b , show that sin(x+y) = 2ab/(a^(2)+b^(2)) and tan (x-y)/2 = sqrt((4-a^(2) -b^(2))/(a^(2) +b^(2))

If sinx + siny = 1/2 and cosx + cosy =1 , then tan(x + y)=.......

If a,b, ne 0 and sinx+siny=a and cosx+cosy=b , find two values of tan((x+y)/2)

If sinx+siny = a, cosx+cosy = b, prove that sin(x+y) = (2ab)/(a^(2)+b^(2))

If sinx+siny = a, cosx+cosy = b, prove that sin(x+y) = (2ab)/(a^(2)+b^(2))

Given that sinx+siny=a and cosx+cosy=b rajan derived the value of tan((x+y)/2) as follows. Fill in the blanks and write the complete solution. Given that sinx+siny=a and cosx+cosy=b .

If sin x+siny=a, cosx+cosy=b , then what is the value of cos(x-y) ?