Question

Найдите производную функции y=(5x-4)cosx

Answer 1

$y = (5x - 4) \cos(x) \\ y' = (5x - 4)' \cos(x) + (5x - 4)( \cos(x) )' = \\ = 5 \cos(x) - (5x - 4) \sin(x)$