(b) Find the co-ordinates of the turning points of the following function: y = 3x4 - 16x³ + 24x² - 12 Identify them as maxima, minima or point of inflexion. (c) A rectangular box with a lid has a volume of 60 mm². The length of the box is three times the height, as shown in Figure 1.1. Find the dimensions of the box so that the surface area is minimum. 3 h h

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