Question 1073725
<pre>
We work with the left side only:

{{{sin(x)/(1-cos(x)) - 1/sin(x)}}} &#8801; {{{1/tan(x)}}}

{{{(sin^2(x)-(1-cos(x)^""))/(sin(x)(1-cos(x)^""))}}}

{{{(sin^2(x)-1+cos(x))/(sin(x)(1-cos(x)^""))}}}

{{{(1-cos^2(x)-1+cos(x))/(sin(x)(1-cos(x)^""))}}}

{{{(-cos^2(x)+cos(x))/(sin(x)(1-cos(x)^""))}}}

{{{(cos(x)(-cos(x)^""+1))/(sin(x)(1-cos(x)^""))}}}

{{{(cos(x)(cross(-cos(x)^""+1)))/(sin(x)(cross(1-cos(x)^"")))}}}

{{{cos(x)/sin(x)}}}

{{{cot(x)}}}

{{{1/tan(x)}}}

Edwin</pre>