How to calculate gcd of 5^{2^{303} - 1} - 1 and 5^{2^{309} - 1} - 1?
I stumbled upon this interesting problem and tried elementary algebraic simplification and manipulation. But found no success.
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}...
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