Question 442986
{{{(1+tan^2(x)) = sec^2(x)}}}
{{{(sec^2(x))/(1-tan^2(x)) }}}
{{{1/(cos^2(x)*(1-tan^2(x)))}}}
{{{ 1/(cos^2(x) - sin^2(x))}}}
{{{ 1/cos(2x) }}}
{{{ sec(2x)}}}