Question

Cos 2227 градусов 30 минут это сколько?!

Answer 1

Cos2227*30'=cos2227,5=cos(2*pi*n+a)=cos(a)
a=2227,5/360=6.1875--->0.1875*360=67.5
cos67.5=cos135/2=sqrt(0.5*(1+cos135))=sqrt(0.5(1-0.5*sqrt2))=
=0.5*sqrt(2-sqrt2)=sqrt(2-sqrt2)/2