This issue has been solved.
I have the following problem:
(K denotes kappa, Y denotes gamma)
Calculate the curvature K(t)= (||Y'(t) X Y''(t)|| / (||Y'(t)||^3))
of the parametrized curve
Y(t)=
Its derivatives are;
Y'(t)=
Y''(t)=
I only need the cross-product OR the determinant of the matrix
det[Y'(t)Y''(t)]
and I cant remember from LinAlg how to do it...
Hope one of you wizes out there can help me =)