The general solution of the differential equation (y² – x³)dx – xydy = 0 (x $$ \ne $$ 0) is : (where c is a constant of integration)

The equation of common tangent to the curves y² = 16x and xy = –4, is :

A plane which bisects the angle between the two given planes 2x – y + 2z – 4 = 0 and x + 2y + 2z – 2 = 0, passes through the point :

The Boolean expression ~(p $$ \Rightarrow $$ (~q)) is equivalent to :