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∫ x^2/√(4-x) dx
=-2∫ x^2 d√(4-x)
=-2x^2.√(4-x) +4∫ x.√(4-x) dx
=-2x^2.√(4-x) -(8/3)∫ x d(4-x)^(3/2)
=-2x^2.√(4-x) -(8/3)x.(4-x)^(3/2) +(8/3)∫ (4-x)^(3/2) dx
=-2x^2.√(4-x) -(8/3)x.(4-x)^(3/2) -(16/15)(4-x)^(5/2) +C
=-2∫ x^2 d√(4-x)
=-2x^2.√(4-x) +4∫ x.√(4-x) dx
=-2x^2.√(4-x) -(8/3)∫ x d(4-x)^(3/2)
=-2x^2.√(4-x) -(8/3)x.(4-x)^(3/2) +(8/3)∫ (4-x)^(3/2) dx
=-2x^2.√(4-x) -(8/3)x.(4-x)^(3/2) -(16/15)(4-x)^(5/2) +C
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