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What is \(\cos(\theta+2\pi)\) equal to?

Answer and explanation

Correct answer: \(\cos \theta\)

The cosine function has period \(2\pi\). Therefore, adding \(2\pi\) returns the point to the same position on the unit circle, giving \(\cos(\theta+2\pi)=\cos\theta\). In contrast, adding \(\pi\) gives \(\cos(\theta+\pi)=-\cos\theta\). Exam tip: for both sine and cosine, adding \(2\pi\) leaves the value unchanged.

Related tags

Trigonometric FunctionsCosinePeriodicityUnit CircleClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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