设 f 有连续导数,而且 f(0) = 0。证明 ∫ (-1/2 to 1/2) (f '(x)^2 dx ≥ 12 * (∫ (-1/2 to 1/2) f(x) dx)^2
设 f 有连续导数,而且 f(0) = 0。证明 ∫ (-1/2 to 1/2) (f '(x)^2 dx ≥ 12 * (∫ (-1/2 to 1/2) f(x) dx)^2
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