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thats not determinant thats modulus if a vector is:http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s10_qp_42.pdf here's the paper for my question in case you need it
x
y
then its modolus is root of the sum of the square of x and y
x^2 + y^2 then root it