Question

f(x)=ln(cos^5(3x^4)) help with chain rule :s

Answer 1

have u tried this? i assume u know the chain rule...

Answer 2

I need to do the product rule right? I'm just beginning to learn this myself, I get confuse in class

Answer 3

\(\large \frac{d}{dx}[lny]=\frac{y'}{y} \)

Answer 4

the product rule is used when u have product of 2 functions, here there is no product, but there is a function inside a function, hence u need chain ruke here.

Answer 5

*rule

Answer 6

(lnU)' = U'/ U
U = cos⁵(3x⁴)
-> U' = 5 cos⁴ (3x⁴) * - sin (3x⁴) * 12 x³