2026 GESS P1 Q5

2026 GESS P1 Q5

Secondary 4
8 marks
  1. Show that \(\sin3x\) can be expressed as \(3\sin x-4\sin^3x\).[3]
  2. Hence find all the values of \(x\) for which \(\sin3x=\sin^2x\), where \(0^\circ\le x\le360^\circ\).[5]

Solution:

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Answer:(a) Shown. (b) \(0^\circ,48.6^\circ,131.4^\circ,180^\circ,270^\circ,360^\circ\).

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