2025 IGCSE Additional Mathematics February/March 0606/12 Q2

3 marks

The diagram shows the curve \(y=a\cos bx+c\) for \(-180^\circ\le x\le180^\circ\).

It is given that \(a\), \(b\) and \(c\) are integers.

Find the values of \(a\), \(b\) and \(c\).[3]

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Answer:\(a=5,\quad b=3,\quad c=-2\)

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