## MATH 20E

This is not the official website, this website is just to post my handouts in sessions. For those who want to link back to official website, please click here

Moreover, I have a drop-off box for students in my session. It is at the box 1 on 6th floor of the APM.

TA: (Anson) Tong Pun Wai

Office hour: Wed 4-5, Fri 4-5.

Office : APM 6414

• HW 1(09/28/11) handout
• HW 2(10/04/11) handout
• ### There are some remarks about assignment 2

• For Q28 in Ex2.1, There is another way to visualize how to draw a 3D graph from three 2-D cross sections. First, we know that there is a family of circle along y-axis and the circles becomes smaller as it closes to the origin along y-axis. So, the next question is how do we join all circles together, by a straight line or by a curve. We know it is a STRAIGHT LINE (I mention it in an email) as the cross section along xy-plane and xz-plane are hyperbola.
• Can you answer the following two questions by yourself?

Do you know when can we apply the L-Hospital's Rule?

Do you know how to show the limit does not exist by using path argument method?

• HW 3(10/11/11) handout
• In the handout, it includes Ex.2.3 Q4ab and 20; Ex.2.5 Q4, 8, 11, 15 and 16; Ex. 2.6 Q9 and 20
• Since I have no solution mannual, so it do happen that my answer is wrong. Please tell me if you find any mistake in my handout. Thanks.

• HW 4(10/18/11) handout
• HW 5(10/25/11) handout
• I use matlab to draw a vector field graph of the question 5 in Ex.4.3. Here is the answer
• HW 6(11/1/11) handout
• HW 7(11/8/11) handout
• HW 8(11/15/11) handout
• HW 9(11/29/11) handout
• For Q7 in ex.8.2, in the HW9 handout, I said you need a high school geometry knowledge to find the area of S'. There is a reference What we use is the statement 4 of Chord Properties of circles on p.1 of the link.