" (i) "quad x=at^(2),y=2at

Find the compounded ratio of: (x+y): (x-y), (x^(2) + y^(2)): (x+y)^(2) and (x^(2)-y^(2))^(2): (x^(4)-y^(4))

The angle between the circles x^(2)+y^(2)=16 and (x-2)^(2)+(y+2)^(2)=25

Add : x^(2) y^(2) , 2x^(2)y^(2) , - 4x^(2)y^(2) , 6x^(2)y^(2)

The solution of the differential equation (x)/(x^(2)+y^(2))dy = ((y)/(x^(2)+y^(2))-1)dx , is