Question 1058468
<pre>{{{ sin(-x)/cos(-x) }}}{{{""=""}}}{{{ sin(0-x)/cos(0-x) }}}{{{""=""}}}{{{(sin(0)cos(x)-cos(0)sin(x))/(cos(0)cos(x)+sin(0)sin(x))}}}{{{""=""}}}

{{{(0*cos(x)-1*sin(x))/(1*cos(x)+0*sin(x))}}}{{{""=""}}}{{{(0-sin(x))/(cos(x)+0)}}}{{{""=""}}}{{{(-sin(x))/cos(x)}}}{{{""=""}}}{{{-sin(x)/cos(x)}}}{{{""=""}}}{{{-tan(x)}}}

Edwin</pre>