Edexcel C2 2007 June — Question 4

Exam BoardEdexcel
ModuleC2 (Core Mathematics 2)
Year2007
SessionJune
TopicSine and Cosine Rules
4. Figure 1 Figure 1 shows the triangle \(A B C\), with \(A B = 6 \mathrm {~cm} , B C = 4 \mathrm {~cm}\) and \(C A = 5 \mathrm {~cm}\).
  1. Show that \(\cos A = \frac { 3 } { 4 }\).
  2. Hence, or otherwise, find the exact value of \(\sin A\).
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