Thread: vector calculus - show that

Show that if are differentiable,



I can do the exact same past exam question when it's cross product, but can't do this one even though its worth fewer marks!

Starting from the LHS:





But really cannot see anyway of getting anywhere near to the RHS from here!

Could anyone please give me a hint?

Thanks in advance!

Originally Posted by hunkydory19

Show that if are differentiable,



I can do the exact same past exam question when it's cross product, but can't do this one even though its worth fewer marks!

Starting from the LHS:



Mr F adds: ......

But really cannot see anyway of getting anywhere near to the RHS from here!

Could anyone please give me a hint?

Thanks in advance!

Product Rule!