$\frac{\sin^3 \theta - \cos^3 \theta}{\sin \theta - \cos \theta} - \frac{\cos \theta}{\sqrt{1 + \cot^2 \theta}} - 2 \tan \theta \cot \theta = -1$ 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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$2\cos^2 \theta - 2\sin^2 \theta = 1$,तो $\theta = \dots \dots ^\circ$

$\tan 20^\circ + \tan 40^\circ + \sqrt{3} \tan 20^\circ \tan 40^\circ = $

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