Because 1/5555555 is extremly close to 1.8E-7, and combining the fact that lim sin(x) as x--> 0 is x (radians), so then sin(1/555555) radians is very close to 1.8E-7. Then convert to degrees --> pi/180. and voila, you get pi*10^-9.
Posted by Kenny M
on 2013-04-02 08:59:29