Find the values of x and y when `x^(2)+y^(2)-2sqrt(2)x+2sqrt(5)y=-7`.

Find the values of x and y if : (3/sqrt5 x-5)+2 sqrt5 yi= sqrt2 .

Find the value of the x^2+7xy+y^2 , when x=-2, y=-5

Find the value of 8xy (x^(2) +y^(2)) when x +y = sqrt3 , and x -y = sqrt2

Find x and y if: ((3)/(sqrt(5))x-5)+i2sqrt(5)y=sqrt(2)

Find the angle between the lines y=(2-sqrt3)(x+5) and y=(2+sqrt3)(x-7) .

Find the angle between the lines y=(2-sqrt3)(x+5) and y=(2+sqrt3)(x-7) .

Find the angle between the lines y=(2-sqrt3)(x+5) and y=(2+sqrt3)(x-7) .

If y=(sin^(-1)x cos^(-1)((x^2)/2))/(1+x^2) then find the value of y(1/2) + y(1/sqrt2) + y(-1/2) + y(-1/sqrt2)

If sqrt(a+ib)=x+iy, then possible value of sqrt(a-ib) is x^(2)+y^(2) b.sqrt(x^(2)+y^(2)) c.x+iydx-iy e.sqrt(x^(2)-y^(2))