(tsint i + tcost j) x (( sint + tcost )i + (cost -tsint)j) =-t^2(sin^2 t+ cos^2t)k Could you please teach me how to get this answer on the RHS? Thank you very much.
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Originally Posted by Jenny20 (tsint i + tcost j) x (( sint + tcost )i + (cost -tsint)j) =-t^2(sin^2 t+ cos^2t)k Could you please teach me how to get this answer on the RHS? Thank you very much. Expanding the determinant across the top row: The and coefficients are obviously 0, so we get: -Dan
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