Saturday, 9 November 2013

number theory - What is the tens digit of 3100?

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

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real analysis - How to find limhrightarrow0fracsin(ha)h

How to find limh0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...