2022 SJI P1 Q2

2022 SJI P1 Q2

IB Year 5 | Grade 11

6 marks

Solve the equation \(2\cos2x-4\cos x=1\), for \(-\pi\leq x\leq\pi\).[6]

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Answer:\(x=\pm\dfrac{2\pi}3\)

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