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

Answer and explanation

Correct answer: \(\cos \theta\)

The cosine function has period \(2\pi\). Therefore, \(\cos(\theta+2\pi)=\cos\theta\), so \(\cos(2\pi+\theta)=\cos\theta\). The expression \(-\cos\theta\) results when \(\pi\) is added to the angle: \(\cos(\theta+\pi)=-\cos\theta\). Exam tip: Adding or subtracting any integral multiple of \(2\pi\) leaves the values of sine and cosine unchanged.

Related tags

Trigonometric FunctionsCosinePeriodicityTrigonometric IdentitiesClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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