Need a hint to compute ∞∑x=0xax and ∞∑x=0x2ax, where a∈(0,1).
Answer
Hint: Differentiate ∑∞x=0ax with respect to a.
How to find lim without lhopital rule? I know when I use lhopital I easy get $$ \lim_{h\rightarrow 0}...
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