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What is the period of the graph (y=\tan x)?

Answer and explanation

Correct answer: (\pi)

The direct answer is option A, \(\pi\). A period is the smallest positive horizontal distance after which a graph repeats exactly. For the tangent function, \(\tan(x+\pi)=\tan x\), because sine and cosine both change sign after adding \(\pi\), so their quotient stays unchanged. Therefore the graph repeats every \(\pi\), not merely after a larger multiple. Option A is correct. Option B, \(2\pi\), is also a repeating distance, but it is not the fundamental or smallest period, so it is less correct in a period MCQ. Option C, \(\frac{\pi}{2}\), is not a period; tangent values do not generally repeat after that shift. Option D, 1, is not a universal repeating distance. Also remember that tangent is undefined at \(x=\frac{\pi}{2}+k\pi\), which produces repeating branches. Exam cue: sine and cosine have period \(2\pi\), while tangent and cotangent have period \(\pi\).

Related tags

GraphsTangentPeriod

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