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= π ∫(2x + 3)² dx ((2 0))
= π/2 ∫(2x + 3)² d(2x + 3)
= π/2 . 1/3 (2x + 3)²
= π/6 ((2.2 + 3)² - (2.0 + 3)²)
= π/6 (49 - 9)
= 20/3 π