Thursday, 4 April 2013

complex analysis - Laurent series of $log(z)sin(1/(z-1))$

I would like to calculate the Laurent series of $$\log(z)\sin \left(\frac{1}{z-1} \right)$$ I have developed separately $\log z$ et the sinus and tried to multiplied them terms by terms but it is complicated. Is there another simplier way?

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real analysis - How to find $lim_{hrightarrow 0}frac{sin(ha)}{h}$

How to find $\lim_{h\rightarrow 0}\frac{\sin(ha)}{h}$ without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...