Sona Srivastava
Last Activity: 15 Years ago
{(a+b+c)x(a+b)}*c = { (a+b+c)Xa + (a+b+c)Xb }*c
= ( axa + bxa + cxa + axb +bxb + cxb )*c
axa = bxb = 0 (vector)
bxa=-axb
= ( cxa +cxb )*c
= (cx(a+b))*c
= - ((a+b)xc)*c
= - (a+b)xcxc
according to rules of vector triple product , = - (a+b)X(cxc)
cxc = 0(vector)
ans = 0(vector)