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Which is the correct expansion of (\sin 3x)?

Answer and explanation

Correct answer: \(3\sin x-4\sin^3 x\)

The standard triple-angle identity is \(\sin 3x=3\sin x-4\sin^3 x\), so option B is correct. Option C is the negative of option B and hence equals \(-\sin 3x\). Option D is related to the triple-angle formula for cosine, not sine. Exam tip: remember that the \(\sin^3 x\) term in \(\sin 3x\) has coefficient 4 and a minus sign.

Related tags

Trigonometric FunctionsTriple Angle IdentitySine FormulaClass 11 MathematicsTrigonometryTrigonometric Functions And Their PropertiesMathematicsClass 12 Mcq

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