22. Repeat exercise 1 in the cases where:

(a) a < 0 < b

(b) a < b < 0

(Hint: Consider

Ð b a ¼

Ð 0 a þ

Ð b 0 for part (a), and identify the relationship between

Ð 0 a

and

Ð

a 0 of the given functions. For part (b), consider the relationship between

Ð b

Ð a and

a

b of the given functions. In both cases keep track of the sign of f ðxÞ.)