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What is the period of the function \(\cos 5x\)?

Answer and explanation

Correct answer: \(\frac{2\pi}{5}\)

The basic cosine function \(\cos t\) repeats after an increase of \(2\pi\) in its angle. For a function of the form \(\cos(kx)\), the input angle changes by \(2\pi\) when \(kx\) changes by \(2\pi\). Thus \(kT=2\pi\), so \(T=2\pi/k\). Here \(k=5\), giving \(T=2\pi/5\). Therefore option A is correct. The factor 5 compresses the graph horizontally and makes the period five times smaller than the usual cosine period. Option D is the period of \(\cos x\), option B is half the required period, and option C incorrectly multiplies rather than divides by the coefficient.

Related tags

Periodic FunctionsCosineGraph TransformationTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematicsClass 12 Mcq

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