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Evaluate: ∫∫dydx/(1 + x^2 + y^2). for y, x ∈ [(0, 1)(0, √(1 + x^2)]

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Evaluate: ∫∫dydx/(1 + x2 + y2). for y, x ∈ [(0, 1)(0, √(1 + x2)]

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π/4[log{x + (x2 + 1)}]01 = π/4[sinh-1x]10 = π/4sinh-1(1)

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