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Question: How to cross product between matrix in maple?

Question:How to cross product between matrix in maple?

MapleFans001 5 Maple
matrix
December 23 2010
0

g(theta) := array([[cos(theta), -sin(theta)],[sin(theta), cos(theta)]]);
dg := map(diff, g(theta), theta);
invg := inverse(g(theta));
w := multiply(invg, dg);
w := map(simplify, w);

crossprod(-w, w); <- have error?

How to cross product between matrix?

As i know wedge product is cross product, so i use cross product
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