stationary points of f(x)= sin^3xcosx

**Boo** · February 4th 2013, 06:55 AM

Please, I search for stationary points of f(x)=sin^3xcosx
I got x +kpi
x/2 +kpi

but result is only first
why??Who is right???
many thanks!!!

**Plato** · February 4th 2013, 07:34 AM

Originally Posted by Boo

Please, I search for stationary points of f(x)=sin^3xcosx
I got x +kpi
x/2 +kpi

Do you mean that $\sin^3(x)\cos(x)$ is the derivative?
Or is that the function for which you are to find stationary points?

If it is the second the neither of those is the answer.

**Boo** · February 4th 2013, 08:42 AM

No, sorry, points of inflection!!!

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