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If (\sin x=\sin y), which relation can generally be true?

Answer and explanation

Correct answer: \(x=2n\pi+y\) or \(x=(2n+1)\pi-y\), where \(n\in\mathbb Z\)

When \(\sin x=\sin y\), the two general families are \(x=2n\pi+y\) and \(x=(2n+1)\pi-y\), where \(n\in\mathbb Z\). The first follows from periodicity, while the second uses \(\sin(\pi-y)=\sin y\). Option B represents only some cases and misses the second family. Exam tip: for equal sine values, remember the angles \(y\) and \(\pi-y\).

Related tags

Trigonometric FunctionsSine EquationGeneral SolutionPeriodicityAngle IdentitiesTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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