Quelpr

Other parts of this question

  1. 3(a)(i)Show that cos 3x = 4 cos³ x – 3 cos x.[6 marks]
  2. 3(a)(ii)Hence, or otherwise, solve cos 6x – cos 2x = 0 for 0 < x < 2π.[9 marks]
  3. 3(b)(i)Express f(2θ) = 3 sin 2θ + 4 cos 2θ in the form r sin (2θ + α) where r > 0 and 0 < α < π/2.[6 marks]

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