I have the following problem:

(Kdenotes kappa,Ydenotes gamma)

Calculate the curvatureK(t)= (||Y'(t) XY''(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 =)