For sin(u/2), cos(u/2), and tan(u/2) given cos(u)=-sqrt2/3 and sin(u)>0 I got sin(u/2)=sqrt(3+sqrt2)/sqrt6 cos(u/2)=sqrt(3-sqrt2)/sqrt6 tan(u/2)=sqrt(3+sqrt2)/sqrt(3-sqrt2) Are these correct?

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