Question

y=cos(6x+9) найти производную

Answer 1

$y=cos(6x+9)\\y'=-sin(6x+9)cdot(6x+9)'=-6sin(6x+9)$

Answer 2

$frac{d}{dx} ( cos(6x + 9) ) = - sin(6x + 9) frac{d}{dx}(6x + 9) = - 6 sin(6x + 9)$