Question 1173045
<pre>

{{{(csc^""(t)+cot^""(t)^""^"")^2}}}{{{""=""}}}{{{(1+cos^""(t))/(1-cos^""(t))}}}

{{{csc^2(t)+2csc^""(t)cot^""(t)+cot^2(t)}}}

{{{1^""/sin^2(t)+2*(1^""/sin^""(t))(cos^""(t)/sin^""(t))+cos^2(t)/sin^2(t)}}}

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

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

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

{{{((1^""+cos^""(t)^"")(1^""+cos^""(t)^""))/((1^""-cos^""(t)^"")(1^""+cos^""(t)^""))}}}

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

{{{(1+cos^""(t))/(1-cos^""(t))}}}

Edwin</pre>