समीकरण $\frac{\sin^3 \theta - \cos^3 \theta}{\sin \theta - \cos \theta} - \frac{\cos \theta}{\sqrt{1 + \cot^2 \theta}} - 2 \tan \theta \cot \theta = -1$ सत्य है यदि:
- A$\theta \in \left( 0, \frac{\pi}{2} \right)$
- B$\theta \in \left( \frac{\pi}{2}, \pi \right)$
- C$\theta \in \left( \pi, \frac{3\pi}{2} \right)$
- D$\theta \in \left( \frac{3\pi}{2}, 2\pi \right)$
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