C-09-Q161mediumsingle_mcqtan90∘\tan 90^\circtan90∘ is—a000b111c∞\infty∞dundefinedব্যাখ্যাTangent equals sinθcosθ\dfrac{\sin\theta}{\cos\theta}cosθsinθ, and at 90∘90^\circ90∘ this is 10\dfrac{1}{0}01, which is undefined.