I don't know how to do this please help. Thanks in advance
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Find the cross product of c and d and you will get one vector that is orthogonal to both c and d. This is the definition of the cross product.
To get a second vector, all you have to do is multiply the first vector you obtained from the cross product by any number, such as 2. This will give you a parallel vector to c x d that is still orthogonal to c and d.
To get a second vector, all you have to do is multiply the first vector you obtained from the cross product by any number, such as 2. This will give you a parallel vector to c x d that is still orthogonal to c and d.