Question 1205943
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Rewrite (2tan(23°)) / (1 - tan^2(23°)) as a single function of an angle. 
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<pre>
What is written in the post, is  (2tan(23°)) / (1 - tan^2(23°)),  or  {{{(2tan(23^o)) / (1 - tan^2(23^o))}}}.

Use the formula/identity  tan(2a) = {{{(2*tan(a))/(1-tan^2(a))}}}.


In your case, angle "a" is  a = 23°.  So, according to the formula,

    {{{(2tan(23^o)) / (1 - tan^2(23^o))}}} = tan(2*23°) = tan(46°).


It is what you want to get.


<U>ANSWER</U>.  (2tan(23°)) / (1 - tan^2(23°)) = tan(46°).
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Solved.