b := 0 t
2 b := Db *Db*q7 + Db *Db *q8 + Db *Db*b *q1 + b *b*q2 + b *b *q3 s 4x 3x x x 5x 4x x 3 2 2 + b *b *q4 + b *b *q5 + b *b *q6 3x 2x 2x x