Question

derive a funçao f(x) = x senx

Answer 1

f(x) x.sen(x)
f'(x) = f'.g+f.g'
f'(x) = 1.sen(x) + x.cos(x)
f'(x) = sen(x) + x.cos(x)

Answer 2

x´*senx + x*senx´=
1*senx+x*cosx=
senx+xcosx