# Recent content by Richard Lee

1. ### Solve the complex number_best way

The best solution is: (x+iy)^2=3-4i=(2-i)^2, therefore x + iy = 2 - i or - 2 + i. Good luck, my maths mates.
2. ### integration: partial fractions question

Origin = int. xdsecx = x secx - int. secxdx = x secx - ln|secx + tanx| + C Good luck!
3. ### Fitzpatrick Solutions

Try 0413 197 399. I got a copy of a solution. It's very good.
4. ### Easy qn

Good! So, sqrt(4+0i)=(+/-)(2+0i) and sqrt(4)=2. I think I know what you mean.
5. ### Easy qn

Thanks! So, sqrt(-1) should be (+/-)i.
6. ### Easy qn2

Since i^2=-1, therefore, i=(+/-)sqrt(-1). Becareful, it's wrong!
7. ### Easy qn

There are two questions; find the square roots of 3+4i and find sqrt(3+4i). Do u think the solutions are same?
8. ### I want inequality questons

Yes! If you check the past pater: Year 1998, you will find this questions! But, I don't think you will find it in this year! Good luck!
9. ### Harder Counting -- can someone do this?

Go to the thread: Probability-q1, then Probability-q2. Follow the questions, you will find the answer by yourself! Good luck!
10. ### Integration

let x=sec^2( u) then the question changed to: integrate : sec (u) / tan (u) d sec^2(u) Try it, you will get it! Good luck!
11. ### More probability. (Simple?)

Good guy! I think you are right. You can find TUTOR everywhere. But there are a few good tutors. So, don't worry about the redundant since the bad tutor will disappear soon. \$60 per? It must be a good tutor. Trust me! I couldn't explain since I need more room and time. But as a good...
12. ### Probability-q2

There are two six letters: two A's, two B's, one C and one D. How many arrangements if two A's and two B's cannot be next to each other? Good luck!
13. ### Probability_q1

I think the answer is 30. First thought: How many arrangements for total: the answer should be: 5P5/2!=60, since there are two A's. Second thought: How many arrangements for two A's togather: the answer should be: 4P4=24 Third: How many arrangements for the first position is B and...
14. ### is this Q in syllabus? (conics)

Thanx! I am very stupid. Change sec function to cos function and tan function to sin function, plz! Thank u!
15. ### More probability. (Simple?)

Go to the thread: Probability_q1, plz! You will find the answer by youself. Good luck!