Verify the Product Rule for cross products

[andyk23]

cross products= vector(a)*vector(b)=Magnitude(a)*magnitude(b)*cos(theta)
I'm having trouble on how to get started...

 

[lanedance]

first that equation is not correct

you probably want to help yourself by using a different symbol for the cross product like x

and you want to be careful with your magnitudes, as the result of a cross product is a vector, which can't be equal to a scalar

 

[lanedance]

also are you sure that's a cos? what's the cross product of 2 parallel vectors?