Question:
If π = ln
, then show that βπ = /π2
(x,y,z)=(x,y,z);
| (x,y,z)|= ;
(x,y,z)= ln| (x,y,z)|= 1/2 ln(x2+y2+z2);
(x,y,z)=( d(x,y,z)/dx, d(x,y,z)/dy, d(x,y,z)/dz);
d(x,y,z)/dx=1/2 dln(x2+y2+z2)/dx=1/2 2 x/(x2+y2+z2)=x/2;
d(x,y,z)/dy=1/2 dln(x2+y2+z2)/dy=1/2 2 y/(x2+y2+z2)=y/2;
(x,y,z)=(x/r2,y/r2,z/r2)=(x,y,z)/r2= /2;
Comments
Leave a comment