Prove by induction that $9 \mid (4^{3n}-1)$ for all natural numbers n.
How do start proof by induction? if n is a natural number, how will Lhs = Rhs
LHS= left hand side RHS = right hand side
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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