Expression 10: "l" Subscript, "e" "n" "g" "t" "h" , Baseline left parenthesis, "T" , right parenthesis equals Start integral from 0 to "T" , end integral, "a" Subscript, "b" "s" , Baseline left parenthesis, "c" Subscript, "u" "r" "v" "e" , Baseline prime left parenthesis, "u" , right parenthesis , right parenthesis "d" "u"lengthT=∫T0abscurve′udu