Sunday, 17 August 2014

calculus - How to know whether an integral can be solved?

I just wonder: How do you know whether an integral can be solved? For example, exponential integral can not be derived to final result.

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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}...