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What is the fundamental period of (f(x)=\tan 3x)?

Answer and explanation

Correct answer: ( \frac{\pi}{3} )

The direct answer is option B, \(\frac{\pi}{3}\). The tangent function repeats after an angle change of \(\pi\), because \(\tan(\theta+\pi)=\tan\theta\). For \(f(x)=\tan 3x\), increase x by T. We need \(3(x+T)=3x+\pi\), so \(3T=\pi\), giving \(T=\frac{\pi}{3}\). Option A, \(3\pi\), is too large and is not the fundamental period. Option B is correct because it is the smallest positive repeating interval. Option C, \(\frac{2\pi}{3}\), is also a repeating interval, but it is twice the smallest one, so it is not fundamental. Option D, \(\pi\), is the period of \(\tan x\), not of \(\tan 3x\). Memory cue: multiplying x by 3 divides the tangent period by 3.

Related tags

Trigonometric-FunctionsPeriodTangent

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