Add my answer to Exercise 2.82.

Included are the following 2 files:

	Exercise_2.82.pdf
	Exercise_2.82.tm

Thank you!
							Lawrence R. Amlord
							   Jul 30th, 2013
							   Xi'an, China
Add a figure into my answer to Exercise 2.82.

Modified are the following 2 files:

	Exercise_2.82.pdf
	Exercise_2.82.tm

Thank you!
							Lawrence R. Amlord
							   Jul 30th, 2013
							   Xi'an, China