If `y=x^3/(x+1)` then `y_3=`

If x : y = 3 : 1 , then x^3 - y^3 : x^3 + y^3 = ?

If xy(x + y) = 1 then,the value of 1/(x^3 y^3) -x^3 - y^3 is

The curves y=x^(3)+x+1 and 2y=x^(3)+5x touch each other at the point

The solution of the differential equation xdy/dx+2y=x^(2),(xne0) with y(1)=1, is (a) y=x^(2)/4+3/(4x^(2)) (b) y=x^(3)/5+1/(5x^(2)) (c) y=3/4x^(2)+3/(4x^(2)) (d) y=4/5x^(3)+1/(5x^(2))