Most efficient way to do this question?
$25^{37}\cong (mod 55)$
Attempt:
$25^2 \cong 20 (mod55)$
Then I don't know the best way to continue... I know how to brute force it but I'm just curious what the best way is?
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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