-5+ $\sqrt{\-45}$
$$\sum_{a}^{b}{C}$$ b= $\infty$
a=n=1
c=x^n-1
converges to 1/1-x
...
x = 3
1649676
36814420
30324376
5608252
6749810
2395199
1463466213318297
482427779239445
.23324843
450,1=5+xy+8+8x
$\sqrt{\-41}$
-6+ $\sqrt{\-4}$
F=1+((x^3)/5!)+((x^7)/9!)-((x^9)/11!)
5×3-2+1×2
