Question 1200880
<pre>
Simplify {{{(1+tan^2(y))cos^2(y)}}}
         {{{matrix(2,1, (1 + sec^2(y) - 1) cos^2(y), sec^2(y) cos^2(y))}}} ----- Substituting sec<sup><b>2</sup>(y) - 1</b> for tan<sup><b>2</sup>(y)</b> 
         {{{matrix(2,1, (1/cos^2(y)) * (cos^2(y)), (1/cross(cos^2(y))) * matrix(1,3, cross((cos^2(y))), "=", highlight(1)))}}} ----- Substituting {{{1/cos^2(y)}}} for sec<sup><b>2</sup>(y)</b>