What is the easiest way to find the sum of all the numbers
$1, 2, 3, ..., 3¹⁰⁰⁰⁰⁰$ that are not divisible by 3,
possibly by using a handheld calculator and avoiding computer processing?
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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