var('x')

var('y')

var('z')

v1=y*z

v2=3*z*x

v3=z

(diff(v3,y)-diff(v2,z))+(diff(v1,z)-diff(v3,x))+(diff(v2,x)-diff(v1,y))

ANSWER:

{{{
-3*x + y + 2*z
}}}

#Sundeep, EnhanceEdu, 9849935890
#Arun, UNCC, 7893377737
#Bala subrahmanyam, VIT-B, 9985415959