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ERoseM
 2 years ago
Find dy/dx if y= tan9x/x^2
ERoseM
 2 years ago
Find dy/dx if y= tan9x/x^2

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micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1All you have to do is derivative tan9x/x². Do you know how to? No?

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

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1Do you know quotient rule?

ERoseM
 2 years ago
Best ResponseYou've already chosen the best response.0Yes, 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

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1Well, actually, to derivative the numeration, you have to use chain rule, you know what it is and how to apply it, right?

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

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1For 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?

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1First, we derivative tan(9x). We only need to derivative tan and left 9x untouched. Is this clear?

ERoseM
 2 years ago
Best ResponseYou've already chosen the best response.0Okay, yes.so then I have that  tan9xtimes 2x

ERoseM
 2 years ago
Best ResponseYou've already chosen the best response.0Thank you for your help but at this point I just can't do this.

micahwood50
 2 years ago
Best ResponseYou've already chosen the best response.1Don't say you can't, you can do it! Just derivative the numerator first. Now, what is derivative of tanx?
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