A Helix is defined by, x(s)=a(s), y(s)=-R(s)*cos(2*pi*np*(s/l)), z(s)=R(s)*sin(2*pi*np*(s/l)) where the amplitude R(s) is 0.LE.R(s).LE.Rh and is given by

R(s)=Rh*((1/pi)*arctan(beta*((s/l)-gama))+0.5) and np represents the no.of turns in helix.Find a(s) sothat the tangent vector [ x'(s), y'(s),z'(s)] has unit length.

Please help me in this regard....

Thanking you