### Homework (Recommended Problems)

Here are the recommended Homework problems for the

- Ninth edition (current edition)

These exercises are not to be handed in for marking. Instead, you are encouraged to work on these selected exercises as part of your studying for the course.

### Assignments

Assignment due dates will be posted on the Announcements page once they have been given in class. Any extra hardcopies of the current assignment will be in the bin outside my office.

### Homework Hints

#### Section 7.3: Operational Properties I

- Question #19: Ick. Please omit! This is a ridiculous partial fraction question unless you have help from technology! Sorry!

#### Section 5.1: Applications

- Ick. I forgot to remind you that if the problem gives you the weight of the mass in pounds, you have to convert it to slugs (yes, slugs!) first,
by dividing the weight by 32. In the metric system, if you have an object weighing 500 N, you find its mass by dividing by 9.8 N/kg, which is also
9.8 m/s
^{2}. In Imperial (or British) units,*g*= 32 ft/s^{2}. Also, change any inches into feet unless you want a tangle of units. Blech. I promise that my assignments and quizzes will all use SI.

#### Section 4.6: Variation of Parameters

- Question 9: Leave your answer for
*u*as an integral (and don't worry about matching the limits exactly – just make sure you've got the correct functional form for the integrand)._{2} - Question 11: Here's a hint:
*e*. You can either do it via long division or by just messing about with the original fraction (see me and I'll show you how.) To see this identity in better formatting, check out Wolfram|Alpha's version.^{2x}/(1+e^{x}) = e^{x}-e^{x}/(1+e^{x}) - Question 13: Here's a hint: for the integral of
*e*, perform the substitution^{2x}sin e^{x}dx*y=e*first. Then your integral becomes the integral of^{x}*y*, which can be done with parts.^{2}sin y dy

### Textbook Errors

None found as of yet.