hello, x=1
 x=1 Sin(x)=0
fgamma(1)=0.999999989064903 0!=1
fgamma(2)=0.999999989064903 1!=1
fgamma(3)=1.99999997812981 2!=2
fgamma(4)=5.99999993438942 3!=6
fgamma(5)=23.9999997375577 4!=24
fgamma(6)=119.999998687788 5!=120
fgamma(7)=719.99999212673 6!=720
fgamma(8)=5039.99994488711 7!=5040
fgamma(9)=40319.9995590969 8!=40320