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Could someone help me solve this:

What are all critical points of $f(x)=\sin(x)/x$ and $f(x)=\cosh(x^2)$?

Mathematica solutions are also accepted.

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    sounds like you should be asking this on [math.se], although the last part technically makes it on-topic here. Also, since this is homework, why don't you start by telling us what you've tried and where you're getting stuck?2012-07-08
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    What do you know about finding critical points?2012-07-08
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    for sin(x)/x I got first derivative. then i calculated value of x, which is tan(x). now what to do further.2012-07-08
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    as now I have to put value of x in second derivative further.2012-07-08
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    $\tan\,x$ is not the correct derivative for $\frac{\sin\,x}{x}$...2012-07-08
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    @J.M. If you're sending it to [math.se], please delete my answer before you do so.2012-07-08

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