# Search results

1. ### Where to find resources for new 4u topics like 3D vectors?

Hi everyone, I have an exam which has 3D vector as one of the topics so I wonder where to find more resources on this topic. All suggestions are highly appreciated!
2. ### [Inverse Trig] Why does the solution only take into consideration 1 case?

Thank you everyone!
3. ### [Inverse Trig] Why does the solution only take into consideration 1 case?

I guess so. How about tan inverse? Is it also from pi/2 to -pi/2 like sine inver
4. ### [Inverse Trig] Why does the solution only take into consideration 1 case?

Hi I am a bit confused by the solution of the following question. In the solution, it automatically assumes that tan(alpha) is negative but if sin(alpha) is negative then alpha can either be in the third quadrant or the fourth quadrant which means that tan(alpha) can either be positive or...
5. ### doing 4 tutoring classes (2 places) for maths (2 for 3u and 2 for 4u). Should I quit 1 place?

Hi there, the title pretty much speaks for itself. I just joined Dr Du 3u and 4u maths last term and I can always barely catch up with the homework they give (2 very hard 20-page hw booklets; 1 for each 3u and 4u). It is just too much and on top of that, I have maths hw from another maths tutor...
6. ### anyone go to Dr Du right now?

Hi is there anyone in the forum who's currently doing 4u maths at Dr Du at Burwood? Does he actually teach or the teacher is an ex-student? Is the teaching good? What topic are you guys up to and if I join now, can I ask for resources of earlier topics? And also, what topics does the entrance...
7. ### Is it too late to start revising for the new term now? And what are the most effective ways to do it?

Hi all, I am currently on holiday and since I have been so busy enjoying the past three weeks to the fullest, I just did an average of one hour of study per day. Now I sort of regret that I did not study more. Is it too late to get serious now? How many hours of daily study should I do if I want...