SOLUTION: I need help solving this using the double angle formulas on one side only: cos2x= (1-tan^2x)/ (1+tan^2x) THANK YOU!

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Question 293733: I need help solving this using the double angle formulas on one side only:
cos2x= (1-tan^2x)/ (1+tan^2x)
THANK YOU!
Answer by Edwin McCravy(20055) About Me  (Show Source):