Question

If f(x)=2cos(8(ln(x)). Find f'(x)

Answer 1

= -2 sin(8(ln x))* 8/x
= [-16 sin (8 ln x)] / x

Answer 2

- this done by the chain rule

Answer 3

Thank you

Answer 4

yw

Answer 5

(f(g))' = f(g)' * g'

Answer 6

you can look at these as a 'function of a function'

eg ln (sin x)

sin x 'inside' ln

so f' = (1 / sinx) * cos x