I need to prove that
(1+2+...+k)2=13+...+k3
using induction.
So the base case holds for 0 because 0=0 (and also for 1: 12=13=1)
I can't prove it for k+1 no matter what I try! Can you give me a hint?
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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