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zurf
 3 years ago
Find the derivative of f(x) = cos (2x^23)
zurf
 3 years ago
Find the derivative of f(x) = cos (2x^23)

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wio
 3 years ago
Best ResponseYou've already chosen the best response.0Do you know how to use the chain rule?

wio
 3 years ago
Best ResponseYou've already chosen the best response.0Well your inner function is \(2x^23\) and your outer function is \(\cos(x)\). There shouldn't be anything hard about this.

zurf
 3 years ago
Best ResponseYou've already chosen the best response.0do we have to use chain rule ? i'm confused on what we should do when with the cos

wio
 3 years ago
Best ResponseYou've already chosen the best response.0The  is just \(1\cdot \cos(x)\). It's a constant. You can pull it out and put it back in after.

zurf
 3 years ago
Best ResponseYou've already chosen the best response.0oh really? but this have to use f(x+h)f(x) first derivation ..

wio
 3 years ago
Best ResponseYou've already chosen the best response.0You have to use this you mean? \[\Large \lim_{h\rightarrow 0}\frac{f(x+h)f(x)}{h}\]

wio
 3 years ago
Best ResponseYou've already chosen the best response.0You're not allowed to use the chain rule?

zurf
 3 years ago
Best ResponseYou've already chosen the best response.0Oh sorry, i just realised it only has to use chain rule. I make things go more complicated _

zurf
 3 years ago
Best ResponseYou've already chosen the best response.0yeah the answer is sin(2x^23)(4x) right ?
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