`` `` `` ``
447.58
$=(a^2-t^2)(2/3a+7/13b)-(t^2-a^2)(4/3a-7/13b)=$
$=(a^2-t^2)(2/3a+7/13b)+(-t^2+a^2)(4/3a-7/13b)=$
$=(a^2-t^2)2a$
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