2(¹₄·3²·π-¹₂·3²)
2(¹₄·3²·π-¹₂·3²)=2(¹₄·9·π-¹₂·9)=2(2.25π-4.5)=5π-9
2(¹₄·3²·π-¹₂·3²) = ¹/₂ · 6²π - 1 · 6² = 3²π - 6² = 9π - 36
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2(¹₄·3²·π-¹₂·3²)=2(¹₄·9·π-¹₂·9)=2(2.25π-4.5)=5π-9
2(¹₄·3²·π-¹₂·3²) = ¹/₂ · 6²π - 1 · 6² = 3²π - 6² = 9π - 36