Question 1203608
.
<pre>

-sin(-x) = sin(x) is reciprocal to csc(x), so their product is 1.


cos(x) is reciprocal to sec(x), so their product is 1.


What is remained, is  {{{tan(x)/cot(x)}}}, which is  tan^2(x).    <U>ANSWER</U>
</pre>

Solved.