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#151 Re: Help Me ! » Polygon » 2008-04-15 16:23:12

You will see in this way. When you divided it into 3 triangle, the sum  of interior is actually the sum of the interior of the 3 triangles , so 3*180=540 degree

#153 Re: Puzzles and Games » The Never-Ending Level » 2008-04-15 08:16:27

JaneFairfax wrote:

I clicked the square at Level 7 but nothing happened.

clicking the inside of the squre doesnt work, you need to click on the line of the squre

#154 Re: Help Me ! » find solution » 2008-04-15 06:32:16

ok, since this thread is too long, I'll just repost my calculation next to Luis'

#156 Re: Help Me ! » find solution » 2008-04-15 05:56:35

Can you describe this part |cos x +|3 in word, I could make it into latex but I must understand it first

#157 Re: Help Me ! » find solution » 2008-04-15 05:51:44

Dont understand this pat |cos x +|3

#158 Re: This is Cool » 0.9999....(recurring) = 1? » 2008-04-15 05:22:55

I believe they are equal, cuz you cant find any number  larger than 0.99999999.... and less than 1

#159 Re: Help Me ! » discrete maths » 2008-04-15 05:19:18

I dont know much about congruence
I looked up the al-Haytham theorm on Wiki
(p-1)! = -1 (mod p)

knowing that  (p-2)!(p-1) = -1 (mod p)
(p-1) = -1 (mod p)

Thus (p-2)! =1 (mod p)

I am not sure if its correct lol

#162 Re: Help Me ! » A Simple Problem (But I don't know how to explain it) » 2008-04-15 04:10:58

You connect those points, then you could compare the graph to other types of funcions'

#163 Re: Help Me ! » co efficients » 2008-04-15 04:08:35

For 3x could only choose (-5 ,4).   -1 could choose (3x,4) and (-5,3x)
3x*(-5)*4+(-1)*3x*4+(-1)*(-5)*3x = -60x-12x+15x=-57x

I'll leave the second one to you

#165 Re: Help Me ! » Limite and proof » 2008-04-13 18:08:24

ok, what bothers me is that last step, It seems that I cant get x>N,  since (x-N)^2>0 , is valid for whaever value of x and N

#166 Help Me ! » Limite and proof » 2008-04-13 17:45:20

Dragonshade
Replies: 4

I tried to prove this, but it doesnt seem satisfying (The last step)

#167 Re: Help Me ! » tough physics problem involving dot product equation » 2008-04-08 03:43:22

How about considering them lying on the same plane


C and C_2 can be calculated, I think the point is the intersection of two circles and it lies inside the triangle?
still thinking about it ..XD

#168 Re: Dark Discussions at Cafe Infinity » So anyone... » 2008-04-08 03:26:32

http://myanimelist.net/animelist/dragonshade
That's my anime list, if I score 10 , that means those are my favs, ^^

#169 Re: Help Me ! » tough physics problem involving dot product equation » 2008-04-08 03:21:15

In my opinion, 3 points could determine a plane in a 3D space, since the 3 particle are in equilibrium, you could put the fourth particle as a point in inside the triangle, and with the same distance to all 3 particles, that point should be the center of a circle inscribing the triangle

#170 Re: Dark Discussions at Cafe Infinity » So anyone... » 2008-04-06 19:03:42

I watched over a hundred TV series of animes........

#172 Re: Help Me ! » Discrete Math Pseudocode » 2008-04-05 22:02:56

But I test it with C++ , I got 374 as well

#include <iostream>

using namespace std;

int main()
{
  int n=3;
  int Sum=0;
do
{
    n=n+7;
    Sum = Sum+n;
}while (Sum < 10000);

cout << n;

return 0;
}

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