`((1)/(x) + (1)/(y)) ((1)/(x) - (1)/(y)) = ?`

Solve for x and y : (1)/(2x) - (1)/(y) = - 1, (1)/(x) + (1)/(2y)= 8 ( x ne 0 , y ne 0 )

solution of the equations (1)/(x)+(1)/(y)=4 and (1)/(x)-(1)/(y)=0

If tan A - tan B = x and cot B - cot A =y , then what is cot ( A -B) equal to ?.............. A) 1/x +ya B) (1)/(xy) C) (1)/(x) -(1)/(y) D) (1)/(x) +1/y

Solve : (1)/(2x)+(1)/(4y)-(1)/(3z)=(1)/(4),(1)/(x)=(1)/(3y),(1)/(x)-(1)/(5y)+(4)/(z)=2 (2)/(15)

If (1)/(x)+(1)/(y)=(1)/(4) and (1)/(x)-(1)/(y)=(3)/(4) , then x=

Solve the following pairs of equations: (1)/(2x)-(1)/(y)=-1, (1)/(x)+(1)/(2y)= -8, x, y ne 0

The equation ((1)/(x))+((1)/(y))=15, and ((1)/(x))((1)/(y))=5 are such that ax=1 and by =1. The values of a and b respectively are _(-)