Question 173925
<pre>Prove the identity
{{{matrix(1,3,(1-2Cos^2x)/(Sin(x)*Cos(x)),"=", Tan(x)-1/Tan(x))}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","",Substitute, Tan(x)=Sin(x)/Cos(x))}}} 

{{{matrix(1,5,
(1-2Cos^2x)/(Sin(x)*Cos(x)), "=", Sin(x)/Cos(x), "-", 1/(( Sin(x) )/( Cos(x) )))}}}

{{{matrix(1,19,"","","", "","","","","","","", "", "","","=", Sin(x)/Cos(x), "-", 1/1,  "÷", (Sin(x))/(Cos(x)))}}}
{{{matrix(1,19,"","","", "","","","","","","", "", "","","=",Sin(x)/Cos(x), "-", 1/1,  "×", (Cos(x))/(Sin(x)))}}}

{{{matrix(1,17,"","","", "","","","","","","", "", "","","=",Sin(x)/Cos(x), "-", (Cos(x))/(Sin(x)))}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","","", Get_LCD=Sin(x)Cos(x))}}}

{{{matrix(1,17,"","","", "","","","","","","", "", "","","=",(Sin(x)Sin(x))/(Cos(x)Sin(x)), "-", (Cos(x)Cos(x))/(Sin(x)Cos(x)) )}}}

{{{matrix(1,17,"","","", "","","","","","","", "", "","","=",(Sin^2x)/(Cos(x)Sin(x)), "-", (Cos^2x)/(Sin(x)Cos(x)) )}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","","=",(Sin^2x-Cos^2)/(Sin(x)Cos(x)) )}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","",Substitute,Sin^2x=1-Cos^2x)}}} 

{{{matrix(1,15,"","","", "","","","","","","", "", "","","=",((1-Cos^2x)-Cos^2x)/(Sin(x)Cos(x)) )}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","","=",(1-Cos^2x-Cos^2x)/(Sin(x)Cos(x)) )}}}

{{{matrix(1,15,"","","", "","","","","","","", "", "","","=",(1-2Cos^2x)/(Sin(x)Cos(x)) )}}}

Edwin