Posted by Marie on Friday, August 3, 2012 at 3:31pm.
(1+tan)/(1-tan)
multiply top and bottom by 1+tan
(1+tan)^2 / (1-tan)(1+tan)
(1 + 2tan + tan^2)/(1-tan^2)
now, since sec^2 = 1+tan^2,
(sec^2 + 2tan)/(1-tan^2)
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