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# differentiation watch

1. Hi guys ,
I'm trying to differentiate the function blow using chain rule but i keep getting wrong answers! do you think chain rule is the way to differentiate this
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2. (Original post by Alen.m)
Hi guys ,
I'm trying to differentiate the function blow using chain rule but i keep getting wrong answers! do you think chain rule is the way to differentiate this
It's a "function of a function", so you need to use the chain rule in some way or other

Post some working if you're still stuck, and someone will take a look at it.
3. (Original post by Alen.m)
Hi guys ,
I'm trying to differentiate the function blow using chain rule but i keep getting wrong answers! do you think chain rule is the way to differentiate this
So if we left f(x) = 2e - x, then you want to do d/dx(2 ln f(x)).

Which is the same as 2 d/dx(ln f(x))).

But the derivatve of ln f(x) is f ' (x) / f(x)
4. i remember i used to this at IGCSE MATHS EDEXCEL
Sorry i never got thos question my questions were more lik
differentiate
2x^2-6x-15

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