2025 Ahmad Ibrahim Secondary School Prelims A Math Paper 1
It is given that \(P\), \(Q\) and \(R\) are the angles of a triangle.
Show that \(\cos P = -\cos (Q + R)\).[2]
Given that \(Q = 45^\circ\) and \(R = 60^\circ\), find \(\cos P\) in the form \(\frac{1}{4}(\sqrt{a} - \sqrt{b})\), where \(a\) and \(b\) are integers.[3]
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