In triangle \(ABC\), \(a\), \(b\) and \(c\) are the opposite sides of the interior angles \(A\), \(B\) and \(C\), respectively.
Let \(s = \frac{a + b + c}{2}\), show that the area of triangle is given by \(\sqrt{s(s - a)(s - b)(s - c)}\).
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