I editted my post because i wrote the question wrong and it should be
Curl (au) = a dot curl (u) + u dot crul (a)where a is a scalar and u is a vector.
Please anyone show me the way the proof this!
Curl (au) = a dot curl (u) + u dot crul (a)where a is a scalar and u is a vector.
All I can think of is to just use the product rule.