b := 0 t
5 2 b := b *q7 + Db *Db*q8 + Db *Db*b*q1 + b *q9 + b *b*q2 + b *b *q4 s 2x x 4x 3x 2x 2 3 + b *b *q3 + b *b*q5 + b *b *q6 2x x x x