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micahwood50Best ResponseYou've already chosen the best response.1
All you have to do is derivative tan9x/x². Do you know how to? No?
 one year ago

ERoseMBest ResponseYou've already chosen the best response.0
I thought I did.. and then I did it wrong on the test. I use the product rule but I didnt follow through correctly.
 one year ago

micahwood50Best ResponseYou've already chosen the best response.1
Do you know quotient rule?
 one year ago

ERoseMBest ResponseYou've already chosen the best response.0
Yes, that's what I meant, I tried to do that and I didn't know what to do with the tan9x? I can't use it as a constant or I tried to put it outside like 9tanx and it came out wrong
 one year ago

micahwood50Best ResponseYou've already chosen the best response.1
Well, actually, to derivative the numeration, you have to use chain rule, you know what it is and how to apply it, right?
 one year ago

ERoseMBest ResponseYou've already chosen the best response.0
I know what it is just no how to use it here. Would it be 1 times 9?
 one year ago

micahwood50Best ResponseYou've already chosen the best response.1
For chain rule, we know that \[\frac{d}{dx}f(g(x)) = f'(g(x)) \cdot g'(x)\]Derivative first function and left second function untouched then derivative second function. Let f(x) be tanx and g(x) be 9x. Do you know what to do next?
 one year ago

micahwood50Best ResponseYou've already chosen the best response.1
First, we derivative tan(9x). We only need to derivative tan and left 9x untouched. Is this clear?
 one year ago

ERoseMBest ResponseYou've already chosen the best response.0
Okay, yes.so then I have that  tan9xtimes 2x
 one year ago

ERoseMBest ResponseYou've already chosen the best response.0
Thank you for your help but at this point I just can't do this.
 one year ago

micahwood50Best ResponseYou've already chosen the best response.1
Don't say you can't, you can do it! Just derivative the numerator first. Now, what is derivative of tanx?
 one year ago
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