Hmm. I get a slightly different cross product from you:
Now then, Faraday's Law gives us that
Just integrate all three of these equations w.r.t. time, and you should be good to go. What do you get?
and are functions of "u"
i have the formula
i want to find B
so i need to integrate the left side by t
in order to get B
but f_1 f_2 are function of u
how to make a result
and then i need to show that
i cant get 0