CAIE P3 2005 June — Question 6

Exam BoardCAIE
ModuleP3 (Pure Mathematics 3)
Year2005
SessionJune
TopicAddition & Double Angle Formulae
6
  1. Prove the identity $$\cos 4 \theta + 4 \cos 2 \theta \equiv 8 \cos ^ { 4 } \theta - 3$$
  2. Hence solve the equation $$\cos 4 \theta + 4 \cos 2 \theta = 2$$ for \(0 ^ { \circ } \leqslant \theta \leqslant 360 ^ { \circ }\).
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