Question 331531
<pre><b>
{{{Cot^2x + Sin^2x}}}{{{""=""}}}{{{Csc^2x}}}

That is not an identity.  For example suppose x=45°, then
{{{Cot("45°")=1}}} and so {{{Cot^2}}}{{{"(45°)"=1^2=1}}}
{{{Sin("45°")=sqrt(2)/2}}} and so {{{Sin^2}}}{{{("45°")=2/4=1/2}}}
{{{Csc^2}}}{{{"(45°)"=1/(Sin(45))^2=1/(1/2)=1*(2/1)=2}}}

Substituting those in the original equation:

{{{1+1/2}}}{{{""=""}}}{{{2}}}
{{{1&1/2}}}{{{""=""}}}{{{2}}}

which is false.

Sorry.

Edwin</pre>