(y*dy)/(x*dx)=sqrt(1+x2+y2+x2y2)
I Ishuda Elite Member Joined Jul 30, 2014 Messages 3,345 Oct 14, 2016 #2 Shaz said: (y*dy)/(x*dx)=sqrt(1+x2+y2+x2y2) Click to expand... Hint: Factor 1+x2+y2+x2y2