document.write( "Question 423743: please help me prove (2tan x/ 1-tan^2 x) (cot x- tan x) =2 \n" ); document.write( "
Algebra.Com's Answer #295868 by lwsshak3(11628)\"\" \"About 
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please help me prove (2tan x/ 1-tan^2 x) (cot x- tan x) =2\r
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\n" ); document.write( "\n" ); document.write( "(2tan x/1-tan^2 x)(cot x-tan x)=2
\n" ); document.write( "starting with left side,
\n" ); document.write( "=2tanxcotx-2tan^2x/1-tan^2x
\n" ); document.write( "tanx*cotx=1
\n" ); document.write( "=2-2tan^2x/1-tan^2x
\n" ); document.write( "=2(1-tan^2x)/(1-tan^2x)=2
\n" ); document.write( "verified: left side = right side\r
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