((x / 2)·√(4 + 1 / x) + (1 / 8)·log{ [ √(4x + 1) + 2√x ] / [ √(4x + 1) - 2√x ] })'((x / 2)·√(4 + 1 / x) + (1 / 8)·log{ [ √(4x + 1) + 2√x ] / [ √(4x + 1) - 2√x ] })'

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