Expression 47: "T" Subscript, 1 , Baseline equals StartFraction, StartNestedFraction, "N" Subscript, 1 , Baseline NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction plus "N" Subscript, 2 , Baseline minus StartNestedFraction, "P" Subscript, 1 , Baseline NestedOver "m" Subscript, 1 , Baseline , EndNestedFraction minus "P" Subscript, 2 , Baseline Over StartNestedFraction, 1 NestedOver "m" Subscript, 2 , Baseline , EndNestedFraction minus StartNestedFraction, 1 NestedOver "m" Subscript, 1 , Baseline , EndNestedFraction , EndFractionT1=N1m2+N2−P1m1−P21m2−1m1