If u = Sinx + Siny + Sin( x + y ) , then simplify u

Siny = Sinx has graph

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 x+y=2pi//3 and sin x//siny=2 , then the

Ifu = sin ^ (- 1) ((x) / (y)) + tan ^ (- 1) ((y) / (x)), showthat x (u) / (x) + y (u ) / (del y) = 0

If u = log ((x ^ (2) + y ^ (2)) / (x + y)), prove that x (u) / (x) + y (u) / (y) = 1

If y = (u -1)/(u + 1) and u = sqrt(x) , then (dy)/(dx) is

If y = sin x^(@) " and " u = cos x " then " (dy)/(dx) is equal to