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Solve for x: 2tan^-1x = cos^-1((1 - a^2)/(1 + a^2)) - cos^-1((1 - b^2)/(1 + b^2)), a > 0, b > 0

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Solve for x:

2tan-1x = cos-1((1 - a2)/(1 + a2)) - cos-1((1 - b2)/(1 + b2)), a > 0, b > 0

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Given equation is

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