The expression $(1 + \tan x + {\tan ^2}x)$ $(1 - \cot x + {\cot ^2}x)$ has the positive values for $x$, given by

  • A

    $0 \le x \le \frac{\pi }{2}$

  • B

    $0 \le x \le \pi $

  • C

    For all $x \in R$

  • D

    $x \ge 0$

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