Ok suppose we have e[itex]^{x}[/itex], by Taylor expansion it becomes [itex]\sum[/itex] x[itex]^{n}[/itex]/n!(adsbygoogle = window.adsbygoogle || []).push({});

Then it was set equal to: [itex]\sum[/itex] x [itex]^{2n}[/itex]/2n! + [itex]\sum[/itex] x [itex]^{2n+1}[/itex]/(2n+1)!

Note: summation in all was from zero to infinity..

How did this take place??

Thanks

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# How did this expansion take place?

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