Define cross-product of two vectors.

Explanation

The cross product of two vectors is the product of magnitudes of two vectors time the sine of the angle between them in the direction of the resultant vector.
If `vecA` and `vecB` are two vectors acting at an angle of `theta` in a given plane then
`vecAxxvecB=AB sinthetahatn`, where `hatn` is the unit vector along `vecAxxvecB`, is known as the cross product of two vectors. The direction of cross product of the two vectors is given by right hand thumb rule.