Answer: D
\( \sin \theta - \cos \theta = 0 \)
or, \( \sin \theta = \cos \theta = \sin (90° - \theta) \)
or, \( \theta = 90° - \theta \)
or, \( 2\theta = 90° \)
∴ \( \cot 2\theta = \cot 90° = 0 \)
\( \sin \theta - \cos \theta = 0 \)
or, \( \sin \theta = \cos \theta = \sin (90° - \theta) \)
or, \( \theta = 90° - \theta \)
or, \( 2\theta = 90° \)
∴ \( \cot 2\theta = \cot 90° = 0 \)
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