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What is $\tan 90^{\circ}$?

A$0$
B$1$
C$\infty$ (undefined)
D$\sqrt{3}$
Answer & Solution
Correct answer: C. $\infty$ (undefined)
$\tan 90^{\circ} = \sin 90^{\circ} / \cos 90^{\circ} = 1/0$ — **undefined**.
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