Question 973868
<pre>
{{{cos^4(x)-sin^4(x)+sin^2(x)}}}

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

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

{{{cos^2(x)-sin^2(x)+sin^2(x)}}}

{{{cos^2(x)-cross(sin^2(x))+cross(sin^2(x))}}}

{{{cos^2(x)}}}

Edwin</pre>