six *dx*x- six *dy*y=- three *dx*x*y^ two + two *dy*x^ two *y

6 multiply by dx multiply by x minus 6 multiply by dy multiply by y equally minus 3 multiply by dx multiply by x multiply by y squared plus 2 multiply by dy multiply by x squared multiply by y

six multiply by dx multiply by x minus six multiply by dy multiply by y equally minus three multiply by dx multiply by x multiply by y to the power of two plus two multiply by dy multiply by x to the power of two multiply by y

6*dx*x-6*dy*y=-3*dx*x*y2+2*dy*x2*y

6*dx*x-6*dy*y=-3*dx*x*y²+2*dy*x²*y

6*dx*x-6*dy*y=-3*dx*x*y to the power of 2+2*dy*x to the power of 2*y