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[ 6*6 - π*(6 / 2)^2 / 2 ] + [ integrate ( 6 - 3*sqrt(4 - (x - 8)^2) ) dx from x =6..8 ]
[ 6*6 - π*(6 / 2)^2 / 2 ] + [ integrate ( 6 - 3*sqrt(4 - (x - 8)^2) ) dx from x =6..8 ]
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