Question

D [lnx. Cosx] derivada

Answer 1

Método del producto:

$[ln(x)]'.Cos(x) + ln(x).[Cos(x)]'= \frac{Cos(x)}{x} - ln(x)Sen(x)$ 

Answer 2

(d/dx)(Inx.Cosx) = (d/dx)(In(x)Cosx) = Cos(d/dx)(In(x)x) = Cos0 = 0

Rpta: 0