C-09-Q156mediumsingle_mcqcot0∘\cot 0^\circcot0∘ is—a000b111c∞\infty∞dundefinedব্যাখ্যাCotangent equals cosθsinθ\dfrac{\cos\theta}{\sin\theta}sinθcosθ, and at 0∘0^\circ0∘ this is , which is undefined.