CAIE P2 2012 June — Question 7

Exam BoardCAIE
ModuleP2 (Pure Mathematics 2)
Year2012
SessionJune
TopicAddition & Double Angle Formulae
7
  1. Show that \(( 2 \sin x + \cos x ) ^ { 2 }\) can be written in the form \(\frac { 5 } { 2 } + 2 \sin 2 x - \frac { 3 } { 2 } \cos 2 x\).
  2. Hence find the exact value of \(\int _ { 0 } ^ { \frac { 1 } { 4 } \pi } ( 2 \sin x + \cos x ) ^ { 2 } \mathrm {~d} x\).
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