Question 946241: How can you make cos beta cos (-beta) - sin beta sin(-beta) =1?
Answer by Alan3354(69443)   (Show Source):
You can put this solution on YOUR website! It's either equal or it isn't (for all values of beta).
You can't make it be equal if it's not.
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You might want to solve for beta.
If so, say, "Solve for beta."
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If you want to prove that it's true for all values of beta, say that.
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