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What is \(\cos(\pi-x)\) equal to?

Answer and explanation

Correct answer: \(-\cos x\)

Using the supplementary-angle identity, \(\cos(\pi-x)=-\cos x\). The cosine of \(\pi-x\) has the same magnitude as \(\cos x\), but the opposite sign. Note that \(\sin(\pi-x)=\sin x\), so the sine options do not apply here. Exam tip: for \(\pi-x\), remember that sine remains positive while cosine changes sign.

Related tags

Trigonometric FunctionsAllied AnglesCosine IdentitiesSupplementary AnglesClass 11 MathematicsTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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