SOLUTION: How does (sec + tan)(sec - tan)=1 come out to be sec^2 - tan^2 =1? Is it the pythagorean identities?

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Question 433443: How does (sec + tan)(sec - tan)=1 come out to be sec^2 - tan^2 =1?
Is it the pythagorean identities?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Change it all to sines and cosines.