પદાવલિ $(1 + \tan x + \tan^2 x)(1 - \cot x + \cot^2 x)$ માટે $x$ ની કઈ કિંમતો માટે ધન મૂલ્યો મળે છે?

  • A
    $0 \le x \le \frac{\pi}{2}$
  • B
    $0 \le x \le \pi$
  • C
    બધા $x \in \mathbb{R}$ માટે
  • D
    $x \ge 0$

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