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What is the fundamental period of cos θ?

Answer and explanation

Correct answer: 2π

A function’s fundamental period is the least positive interval after which all its values repeat. Cosine is the horizontal coordinate of a point moving around the unit circle, and a complete revolution has measure 2π. Consequently, cos(θ + 2π) = cos θ for every θ. A shift of π gives cos(θ + π) = −cos θ, so π is not the period of the original cosine values; π/2 also does not reproduce every value, while 4π repeats the function only after two complete revolutions and is therefore not fundamental. Thus the correct answer is option D, 2π. Sine and cosine have the same fundamental period even though their graphs are phase-shifted.

Related tags

Trigonometric-FunctionsPeriodCosineTrigonometric Functions And Their PropertiesTrigonometric FunctionsMathematicsClass 12 Mcq

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