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(1/3)*4a/(a+1)^2 * 2a / (a+1) + 4 - (2a / (a+1))^2 - 8/3 + (1/3) * (2*a / (a+1))^3 = 7/12
(1/3)*4a/(a+1)^2 * 2a / (a+1) + 4 - (2a / (a+1))^2 - 8/3 + (1/3) * (2*a / (a+1))^3 = 7/12
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