[" 27."sqrt(1+x^(2)+y^(2)+x^(2)y^(2))+xy(dy)/(dx)=0],[" 28."x sqrt(1+y^(2))" ."]

solve sqrt(1+x^(2)+y^(2)+xy)+xy(dy)/(dx)=0

Solve the following differential equation: sqrt(1+x^(2)+y^(2)+x^(2)y^(2))+xy(dy)/(dx)=0

sqrt(1-x^(2))+sqrt(1-y^(2))=a(x-y),show(dy)/(dx)=sqrt((1-y^(2))/(1-x^(2)))

Solve sqrt(1+x^(2)) sqrt(1+y^(2))dx+xy dy=0

(y)/(x)(dy)/(dx)=sqrt(1+x^(2)+y^(2)+x^(2)y^(2))

Solve the following differential equations. (i) (dy)/(dx) =(1+y^(2))/(1+x^(2)) (ii) (dy)/(dx) = (sqrt(1-y^(2)))/(sqrt(1-x^(2))) (iii) (dy)/(dx) = 2y tan hx (iv) sqrt(1+x^(2))dx + sqrt(1+y^(2))dy = 0 (v) (dy)/(dy) = e^(x-y)+x^(2)e^(-y)