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

Answer and explanation

Correct answer: \(\cos x\)

The cosine function has period \(2\pi\). Therefore, adding \(2\pi\) to any angle \(x\) does not change its cosine: \(\cos(x+2\pi)=\cos x\). Hence, \(\cos x\) is correct. The expression \(-\cos x\) occurs on adding \(\pi\), since \(\cos(x+\pi)=-\cos x\). Exam tip: Remember that both \(\sin x\) and \(\cos x\) have period \(2\pi\).

Related tags

Trigonometric FunctionsCosinePeriodicityAngle IdentitiesClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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