Evaluate the Expression $\frac { 1 } { \tan x + \cot x }$

Multiple Choice

Evaluate the expression.
$\frac { 1 } { \tan x + \cot x }$

A) $- \sin ^ { 2 } x$
B) $\sin x$
C) $\sin x \cos x$
D) $\cos ^ { 2 } x$
E) 0