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sin(u)=5/13-> opp=5, hyp=13=> adj=sqrt(13^2-5^2)=12cos(u)=12/13sin(u/2)=sqrt((1-cos(u))/2)sin(u/2)=sqrt((1-12/13)/2)sin(u/2)=sqrt((1/13)/2)sin(u/2)=sqrt((1/26)sin(u/2)=sqrt(26)/26
sin(u)=5/13-> opp=5, hyp=13=> adj=sqrt(13^2-5^2)=12
cos(u)=12/13
sin(u/2)=sqrt((1-cos(u))/2)
sin(u/2)=sqrt((1-12/13)/2)
sin(u/2)=sqrt((1/13)/2)
sin(u/2)=sqrt((1/26)
sin(u/2)=sqrt(26)/26
