21. Value of 'c' of the mean value theorem for the function f(x) = x(x - 2), when a = 0, b = 3/2, is
22. If f(x , y) = x2 + y2, then ∇2 f is

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25. Area bounded by the parabola 2y = x2 and the line x = y - 4 is equal to

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