I have been trying to solve a question that arose in my mind a couple of days ago.
What is the sum of:
$1+4+9+16+25+\cdots +n^2$?
It is the sum of squares of each numbers starting from $1$ to $n$.
Can there be any formula for this sum?
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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