Cross product question of j ,k

[krot]

http://i26.tinypic.com/27zdaiv.gif

i know that i should do right hand rule to know the result
but here the vectors are weird

??

 

[Doc Al]

Just multiply it out, taking the cross-products of each component.

j X j = ?
j X k = ?
k X k = ?

 

[krot]

ahh i could solve it by definition of cross product
by determinant
thanks