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What is the simplified value of \(\sin(\pi+x)+\sin(\pi-x)\)?

Answer and explanation

Correct answer: \(0\)

Using allied-angle identities, \(\sin(\pi+x)=-\sin x\) and \(\sin(\pi-x)=\sin x\). Therefore, \(\sin(\pi+x)+\sin(\pi-x)=-\sin x+\sin x=0\). The result \(2\sin x\) would occur only if both terms had the same sign, which they do not here. Exam tip: for angles of the form \(\pi\pm x\), determine the sign by identifying the quadrant.

Related tags

Trigonometric FunctionsAllied AnglesSine IdentitiesTrigonometric SimplificationTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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