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Other parts of this question

  1. 4(a)Solve cos 2θ - 3 cos θ = 1 for 0 ≤ θ < 2π.[6 marks]
  2. 4(c)Prove that cos⁴A - sin⁴A + 1 = 2 cos²A.[5 marks]
  3. 4(d)Given that sin A = 12/13 and sin B = 4/5, where A and B are acute angles, find cos (A - B) and sin (A + B).[8 marks]

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