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junior college 1 | H2 Maths

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= ( (r+½)² + (r-½)² ) x ( (r+½)² - (r-½)² )

= ( r² + r + ¼ + r² - r + ¼) x (r² + r + ¼ - (r² - r + ¼) )

= (2r² + ½) (2r)

= 4r³ + r (verified)

Use Method of Difference to solve the summation.

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