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calculusfunctionsBest ResponseYou've already chosen the best response.1
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?
 one year ago

swin2013Best ResponseYou've already chosen the best response.2
so it's 1/cos(w1) * sin(w1) *1?
 one year ago

calculusfunctionsBest ResponseYou've already chosen the best response.1
Sorry, that should be dx in the first denominator.
 one year ago

calculusfunctionsBest ResponseYou've already chosen the best response.1
\[\frac{ d(\ln (\cos (w 1)) }{ dx }=\frac{ \sin (w 1) }{ \cos (w 1) }=\tan (w 1)\]Understand?
 one year ago

calculusfunctionsBest ResponseYou've already chosen the best response.1
@swin2013 I asked if you understood.
 one year ago

swin2013Best ResponseYou've already chosen the best response.2
yes i do sorry, i was working on another problem :)
 one year ago
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