x = 2sinθ 4-x^2 = 4-4sin^2θ = 4cos^2θ dx = 2cosθ dθ Then you have ∫ x^2/√(4-x^2) dx = ∫4sin^2θ/2cosθ * 2cosθ dθ = ∫4sin^2θ dθ = ∫2(1-cos2θ) dθ ...
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