Math Is Fun Forum

Total degrees in a circle is 360. So if that part is 120 and the total is 360 then:

y + 120 = 360
y = 240 degrees

Is the AB line parallel to the CD line? You dont specify it?

I will assume it is.

I dont know how to give a logical geometric proof but this is my logic:

Suppose the AB line keeps going. This angle is 60 degrees because the half circle formed by the line is total 180. Since AB and CD are parallel (?) then the other angle is also 60 degrees and x is also 60 degrees. I do not recall the theorem names but each of this steps I did was because of certain theorems having to do with parallel lines in geometry.

Hope this helps.

I followed all your steps but can you explain what you did to get here:

Anyways:

Now I must say that I wouldnt have got this idea if I didnt see your solution. Anyways, I was just wasting some time with this problem.

Your initial solution had to include a +C as a result to the integral (which you didnt put). You know when you do an integration you always put a +C in the end. However, in this case the +C was part of the ln(y) solution. So when you raise e to both sides, thats how you get e^C

Get it now?

Note: Thats as far as I can get it. I dont know how to solve the series.

Yes. When I put "..." it implies it goes on and on (to infinity).

See my post #11

Do you mean this?

I also dont fully understand the problem.

Now that I read my post again, I realize it was a little bit too dramatic and emo. I certainly didnt want it to turn out like that.

I dont think theres nothing wrong in comparing yourself with other people since it gives you something to work towards (as long as it doesnt include jealousy and the like).

As I said, theres always people better than you in something. But as someone here mentioned, they are probably lacking on other aspects. Such as social life etc.

Yes MathIsFun, im young, im just 18

Anyways, thanks all for your posts.

This is how I prepare for my tests, Im not sure they will help you but its how I do it.

I used to read the chapters and try to understand all the concepts, memorize the theorems etc. I made sure I knew everything well. But I found out that isnt enough when taking a test. Even though I knew everything well, I would always lose little points like you said.

What I started doing for every test from then on is I would do the same I used to do, read the chapters 1-2 times, make sure I understand all the concepts, memorize all the theorems etc.

Now I will do ALL the problems on the back of the chapter section. All of them. They are a lot (about 50+ or so) but its worth it in my opinion. When I finished the problems. I would go back to the chapter, read it again and do ALL the problems again. You might say "why again? " Well, I found that if you do the problems once its not enough practice and you will notice this when you try to do them for the second time, you still struggle with some problems which you have already done. This helps to really grind that practice and get used to all types of problems that might pop up on the test.

This is what I been doing for all my tests. I just had a test on monday on the convergence of series, taylor and maclaurin polynomials and series, integration and differentiation of series etc. I got a 100 on the test where before I would get around a 90 for little mistakes etc.

Dont know if this helps you.

I cant do arithmetic fast without paper as well.

My story is sadder...

First test on Physics I got a 94. Good enough.

My second test was on the SAME stuff as you, torque, collisions, angular etc. I got a 26 on it... I just didnt understand the stuff to be honest. I just dropped the class.

math > physics

I believe you cant simplify anymore.

Yes you dont need to worry about the negative root.

Trigonometric substitution. I checked all your work and its correct.