SOLUTION: In proving a trig identity, why is working only one side important? Can you provide an example where working both sides gives a different result than working on only one side?

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Question 889330: In proving a trig identity, why is working only one side important?
Can you provide an example where working both sides gives a different result than working on only one side?

Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Hey, I just answered this for you a couple of minutes ago.
-- Excuse me; I did not provide any example. You should find those in your textbook.