Question 1028518
<pre>
{{{(sin^""(x)-1^""^"")(tan^""(x)^""+sec^""(x))=-cos^""(x)}}}

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

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

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

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

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

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

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

{{{(-(cos^cross(2)(x)^""))/cross(cos^""(x)^"")}}}

{{{-cos^""(x)}}}

Edwin</pre>