#### mmmladenov1

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- Thread starter mmmladenov1
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- Joined
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- Joined
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You can ignore the first one, the rest is as mentioned in the title of the thread.ég tala ekki þýsku

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- Nov 12, 2017

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I can't even tell how many separate questions there are here (there are two "part b"s!), or what the instructions apply to.

Please make

Welcome to our tutoring boards! :) This page summarizes some main points from our posting guidelines. As our name implies, we provide math help (primarily to students with homework). We do not generally post immediate answers or step-by-step solutions. We prefer to help by having a...

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It can be proved by complete induction that:

[math]f(x) = x \cdot sin(x) \implies \text {the n}^{th} \text { derivative} = x \cdot sin \left (x + \dfrac{n \pi}{2} \right ) + n \cdot sin \left ( x + \dfrac{(n - 1) \pi}{2} \right ).[/math]

I am guessing that “complete induction” is what we call “weak mathematical induction.” I suspect this theorem is to be used (rather than proved) to find the indicated limits.