SOLUTION: Verify that (1-tanx)/(1+tanx)= 2cos^2x-1

Question 976153: Verify that
(1-tanx)/(1+tanx)= 2cos^2x-1
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
There must be a typo, but I cannot guess what it should be.
is not true for all values of .
For example, for the angle shown here ,
, , and .
In that case,
(rounded), and

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