Prove that 5353−333 is divisible by 10
I don't know modular arithmetic, so I tried things like that:
533⋅5350−333=(33+20)3⋅5350−333=(33+20)(33+20)(33+20)⋅5350−333
but I get stuck and don't know how to continue
How to find limh→0sin(ha)h without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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