Use the "mixed partials" check to see if the following differential equation is exact.
(3x^3 − 3y) dx + (−3x + 2y1) dy = 0
If it is exact find a function F(x, y) whose differential, dF(xy) is the left hand side of the differential equation. That is, level curves F(xy)=C are solutions to the differential equation.

The equation is exact

F(x,y) = 3x4/4  - 3xy -y2

Step-by-step explanation:

The step by step explanation and to ascertain the exactness of the differential equation is as shown in the attached file.

#15. square

step-by-step explanation:

because quadrilatural (idk how to spell it) means somthing that is not 3d or like, equal sides (or somthing like that   you know what i meanz)

hope this halps!

bai!