in my post#8 there is a typing error in last line......
"" apply sinAsinB=1/2 (cos(A-B)-cos(A+B))""
plz cope with me.......[1][1]
Prove
\sum_{x,y,x}^{}{\sin x \sin y \sin(x-y)+\sin(x-y)\sin(y-z)\sin(z-x)} = 0
JEE 1978
in my post#8 there is a typing error in last line......
"" apply sinAsinB=1/2 (cos(A-B)-cos(A+B))""
plz cope with me.......[1][1]
oops then maybe i misinterpreted it for more than 2 hours..........[3][3]