SOLUTION: solve by completing the square: x^2-2x-1=0
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130r tee 1 1/2 x 1/2 x 1 1/4 +GF+ GEORG FISCHER FITT - 770130263
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y=2x+1 e y=2x-1
![Calcolare il lim [(x²-1)/(x²+2x+1)], per x→ -1 - YouTube](https://i.ytimg.com/vi/lffCHKudgyQ/maxresdefault.jpg "Calcolare il lim [(x²-1)/(x²+2x+1)], per x→ -1 - YouTube")
Calcolare il lim [(x²-1)/(x²+2x+1)], per x→ -1 - YouTube
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![Solve `[(2x+1)!]/[(x+2)!] xx [(x-1)!]/[(2x-1)!] =3/5` ; `(x in N)` - YouTube](https://i.ytimg.com/vi/nyfy6dsU56w/maxresdefault.jpg "Solve `[(2x+1)!]/[(x+2)!] xx [(x-1)!]/[(2x-1)!] =3/5` ; `(x in N)` - YouTube")
Solve `[(2x+1)!]/[(x+2)!] xx [(x-1)!]/[(2x-1)!] =3/5` ; `(x in N)` - YouTube
