Can you explain to me why (sint i + cost j) x (cost i - sint j) = -sin^2t k - cos^2t k ? where i , j, k are unit vectors. Thank you very much.
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Originally Posted by Jenny20 Can you explain to me why (sint i + cost j) x (cost i - sint j) = -sin^2t k - cos^2t k ? where i , j, k are unit vectors. Thank you very much. Hello, Jenny, I only know the cross product with vectors. To use vectors I re-write your problem: v_1 = (sin(t), cos(t), 0) v_2 = (cos(t), -sin(t), 0) Now calculate the cross-product: Maybe this helps a little bit further. EB
Hello, Jenny! Can you explain to me why ? Do you know how to find a cross product? We have two vectors: . and . . Then: . Now crank it out: . Got it?
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