Saturday, 9 November 2013

number theory - What is the tens digit of $3^{100}$?

Is there a general formula to calculate the n-th digit of any big number?

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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}...