### Homework (Recommended Problems)

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.

- Here are the recommended homework problems for the

### 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.

- Assignment #1 and Solutions
- Assignment #2 and Solutions
- Assignment #3 and Solutions – ignore 3(b)
- Assignment #4 and Solutions
- Quasi-Assignment #5 and Solutions

### Homework Hints

Section 31.1:

- Question #27: this one's just nasty. Here's Gilles' elegant solution, and here's my own grind-it-through answer.

Section 31.2:

- Question #11: the integral of ln
*x dx*needs to be done using parts.

Section 31.3:

- Question #7: (sneaky) divide both sides by
*A*and try to group some terms into the differential of a quotient^{2} - Question #17: (sneaky) multiply both sides of the equation by
*y* - Question #21: I did it using two substitutions

### Textbook/SSM Errors

Section 31.4:

- In the 9th edition (and possibly the 10th, but I don't have that edition handy), the answer to Question #17 should be
*y = x + e*/ 2 - 1^{x}*+ C e*(the textbook answer is missing the^{-x}*e*on the term with the^{-x}*C*)

Section 31.10:

- In the Student Solution Manual (SSM), Question #9: because the right-hand-side of the DE is just a
constant, your particular solution
*S*_{p}should just be a constant (*A*, for example). You do not require a linear term in*t*.