If `a=x/(x+y)` and `b=y/(x-y)` , then `(a b)/(a+b)` is equal to (a) `(x y)/(x^2+y^2)` (b) `(x^2+y^2)/(x y)` (c) `x/(x+y)` (d) `(y/(x+y))^2`

The average of the reciprocals of x and y is (a) ((x+y))/((x-y)) (b) ((x+y))/(2xy) (c) (2(x+y))/(xy) (d) (2xy)/((x+y))

If x^(y)=y^(x), then ((x)/(y))^(x/y) is equal to a.x^(y/x) b.x^((x)/(y)-1) c.1d.x^((x)/(y))

If a=(x)/(x^(2)+y^(2)) and b=(y)/(x^(2)+y^(2)) then value of (x+y) is

If sin^(-1)((x^(2)-y^(2))/(x^(2)+y^(2)))=log a,then(dy)/(dx) is equal to (x)/(y)( b) (y)/(x^(2))(x^(2)-y^(2))/(x^(2)+y^(2)) (d) (y)/(x)

a=(x)/(x^(2)+y^(2)) and b=(y)/(x^(2)+y^(2)) then find the value of x+y

a=(x)/(x^(2)+y^(2)) and b=(y)/(x^(2)+y^(2)) then find the value of x+y

a=(x)/(x^(2)+y^(2)) and b=(y)/(x^(2)+y^(2)) then find the value of x+y

If a=(x)/(x^(2)+y^(2))and b=(y)/(x^(2)+y^(2)). The value of (x+y) is

If x and y are of same sign,then the value of (x^(3))/(2)cos ec^(2)((1)/(2)(tan^(-1)x)/(y))+(y^(3))/(2)sec^(2)((1)/(2)(tan^(-1)y)/(x)) is equal to (x-y)(x^(2)+y^(2)) (b) (x+y)(x^(2)-y^(2))(x+y)(x^(2)+y^(2))*(d)(x-y)(x^(2)-y^(2))