Add my illustration to Exercise 4.41.

Included are the following 2 files:

	Exercise_4.41.pdf
	Exercise_4.41.tm

Thank you!
							Lawrence X. Amlord
							  Mar 4th, 2014
							  Xi'an, China
Add my answer to Exercise 4.42.

Included are the following 2 files:

	Exercise_4.42.pdf
	Exercise_4.42.tm

Thank you!
							Lawrence X. Amlord
							  Mar 6th, 2014
							  Xi'an, China