SOLUTION: 12. Is x � x ever equal to x?

Question 413472: 12. Is x � x ever equal to x?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
It could happen. If , then --> , x = 0 or 1.

However you stated the subject was "trigonometry." You may be referring to the dot product of two vectors A and B. If X is a vector, then we want the dot product equal to the original vector in direction and magnitude, hence

, where is the angle in between. Since we're multiplying the same vector, and . It is indeed possible to have a vector such that , which happens when X = 1i+0j or X = 0.
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