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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- February 2nd 2007, 07:35 AMJenny20cross product
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. - February 2nd 2007, 08:46 AMearboth
- February 2nd 2007, 08:53 AMSoroban
Hello, Jenny!

Quote:

Can you explain to me why

?

**how**to find a cross product?

We have two vectors: . and

. . Then: .

Now crank it out: .

Got it?