Answer to Physics Exercises : Dynamic Rotation And Equilibrium

Download Answer : pdf document. No Password.

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Answer to LC Final Term Exam

Hi there, for you LC pupils. I try to provide answers for your physics and math final term exams. By now, I just have the exam paper of Physics grade XI and Math grade XI. I don't think that you need the answer of Math. I am sure, your teacher have provided the keys soon.... (ehmm).
I try my best to give you these answers. You can download it, no password needed.If you have another exam paper, you can email me (kttedu@gmail.com). Thanks for your support.

Download Answer to Physics Final 1st term examination

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Physics Answer to Problem for Grade XI

Don't worry..... Finally I provide this answer to you all....
Email me at kttedu@gmail.com to get the password.
This exercise consists of 23 problems, fully solved ranging from motion in one dimension, rotational motion, elasticity, and dynamics.

Download Physics Solved Problems

Trigonometry Identity

Many secondary students think it is hard to prove trigonometry identities. It is absolutely true if they don't remember the basic formula well. For those who have the formulas in their mind, they still need more exercises to increase their confidence against the problems.

By practicing and practicing, you will be more and more skillful in this subject.

This is the list of the simplest formulas for trigonometry identity.


Then there are some formulas, that is rather difficult than the previous ones. Here they are :


From these formulas, we can derive another harder formulas like some formulas below.

There are also some useful shorthand formulas derived form the formulas above. Think about the formula for

This fomula is derived from the base formula

Using this formula directly despite of writing of the process from the basic formula will reduce our work in solving the identity problems.
Below I want to present one tricky formula than can be directly used in some situations.

This is beautiful I think. Through many practicing to solve problems, you can develop your skill and expanding your scoop and overview about trigonometry identities. I have some solved exercises for you. You can see how they solved. You may try your best with your own way to solve the problem. What I have worked for you just one of the some ways that may be exist. Here is the link you can use to download the solved problems. Wish you luck.... (email me for the password).