Question

derivative?

Answer 1

\[\ln(\cos(w-1))\]

Answer 2

To take the derivative of the natural logarithm function, divide the derivative of the argument function by the argument function. Thus\[\frac{ d(\ln f(x)) }{ x }=\frac{ f \prime(x) }{ f(x) }\]Do you understand?

Answer 3

so it's 1/cos(w-1) * -sin(w-1) *1?

Answer 4

Sorry, that should be dx in the first denominator.

Answer 5

YES!!

Answer 6

\[\frac{ d(\ln (\cos (w -1)) }{ dx }=\frac{ -\sin (w -1) }{ \cos (w -1) }=-\tan (w -1)\]Understand?

Answer 7

@swin2013 I asked if you understood.

Answer 8

yes i do sorry, i was working on another problem :)

Answer 9

No worries!