Question

f(x)=5cos(7ln(x)) , find f(x)`

Answer 1

@jim_thompson5910

Answer 2

you need its derivative ?

Answer 3

yes

Answer 4

\[\Large f(x)=5\cos(7\ln(x))\]
using standard formulas with chain rule .
\[\Large f'(x)=-5\sin(7(\ln(x))*\frac{d}{dx}(7\ln(x)\]
\[\Large -35\sin(7\ln(x))*\frac{1}{x}\]

Answer 5

i entered it , and it ws wrong

Answer 6

(online homework)

Answer 7

post a screenshot of what you entered

Answer 8

ok.

Answer 9

you're missing a 35

Answer 10

otherwise, everything else is correct

Answer 11

you'll probably want a decimal approximation for the second one

Answer 12

Ops i did miss out 35 . its correct! thanks I wont to give both of medal. how do i do that?

Answer 13

just give it to sami since that user did all the work really