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Stationary Points (Practical type) Example 1 : ExamSolutions

A cuboid has a volume of 8m3. The base of the cuboid is square with sides of length x metres. The surface area of the cuboid is Am2. (i) Show that A = 2x^2 +32/x (ii) Find dA/dx (iii) Find the value of x which gives the smallest surface area of the cuboid, justifying your answer.
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