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#26 Re: Help Me ! » without the calculater » 2007-01-19 19:58:02
i got sin 75 but the problem with sin 25
sin 75 = sin ( 45 + 30 ) = sin 45 cos 30 + cos 45 sin 30 = ( √ 3 + 1 ) / ( 2 √ 2 )
#27 Help Me ! » without the calculater » 2007-01-19 19:19:55
- RauLiTo
- Replies: 9
get the value of :
sin 75 + sin 25
#28 Re: Help Me ! » Terms » 2007-01-06 07:11:32
( X + Y ) ^ 7
3rd term = 7 nCr 2 * ( X ) ^ 5 * ( y ) ^ 2 = 21 X ^ 5 y ^ 2
as mathsy said 
#29 Re: Dark Discussions at Cafe Infinity » eid mubarak » 2007-01-03 07:10:44
for me eid was boring 
there are alot of muslims here
#30 Re: Help Me ! » probabilities » 2006-12-26 03:25:09
thanks alot alot mathsy ... you really helped !
#31 Re: Help Me ! » probabilities » 2006-12-26 03:01:26
excuse me can you explain it more for me please ?! :$
#32 Re: Help Me ! » probabilities » 2006-12-26 02:22:34
sorry ... but i dont know what do they call those numbers which doesnt divide by 2 in english !
when i read the question i answer it immediately like you but then i thought about it ...
we cant put '' 0 '' in the last digits because it will be a number with 3 digits ! ...
thanks
#33 Re: Help Me ! » probabilities » 2006-12-26 02:11:26
maybe its not clear ... ?!
#34 Help Me ! » probabilities » 2006-12-26 01:07:34
- RauLiTo
- Replies: 7
i have today a confusing question in the probability and its say :
if we have X : { 0 , 1 , 2 , 3 , 4 , 5 }
how many numbers can we make from that group without using the same digits in the same number ... the number contain 4 digits and it must be individual (( doesnt divide by 2 ))
please answer me ... i need help tomorrow is my final exam in school ! 
#35 Re: Help Me ! » inner product » 2006-12-15 20:03:13
thaaaaanks btw its not 106 its 105
thans again
#36 Re: Help Me ! » inner product » 2006-12-15 06:50:40
the final answer is - 30 ... anybody ?
#37 Re: Help Me ! » inner product » 2006-12-14 16:32:40
guys ?!
#38 Re: Help Me ! » inner product » 2006-12-14 05:11:56
theta is the angle between L and M so we cant use it to get the first equation you said
#39 Re: Help Me ! » inner product » 2006-12-14 04:44:54
no man i meant with the two vectors L and M ... we have L but we have to get M first
#40 Help Me ! » inner product » 2006-12-13 21:48:50
- RauLiTo
- Replies: 11
hi guys ... how are you ?!
if you know that : || L || = 4 ... || 2 L + M || = 13 ... the angle between the two vectors is θ = 120 ... what is the inner product of these two vectors ?! it looks easy but i dont know why they told me that my answer is wrong which was - 10 or 42 
help please ...
#41 Re: Help Me ! » more than one way ... » 2006-11-28 06:00:12
although i dont know what are you talking about maybe because i didnt study that yet thank you all guys u really care ...
who can solve this in easy way :
2 ^ x = x ^ 2
#42 Re: Help Me ! » more than one way ... » 2006-11-27 14:49:03
nobody ?!
#43 Re: Help Me ! » more than one way ... » 2006-11-27 07:41:02
ooh okay thanks anyways ... guys anybody can help please ?
#44 Re: Help Me ! » more than one way ... » 2006-11-27 07:36:48
thats the problem ... but nothing is impossible in math !
#45 Help Me ! » more than one way ... » 2006-11-27 06:52:25
- RauLiTo
- Replies: 13
solve this :
3 ^ n = 2 ^ ( n + 1 ) + 1
one of the solution is n = 2 ... but i want the way it can solved and if its possible more than one way
thanks lovely members
#46 Re: Help Me ! » whats the remain » 2006-11-20 08:08:19
lol thats easy ! thanks pi
#47 Re: Help Me ! » hi » 2006-11-20 08:07:10
x = 2 ... y = 2
perpendicular which means m1 * m2 = - 1
m1 = 2 / 3
m2 = - 3 / 2
y - y1 = m ( x - x1 )
y - 2 = -3 / 2 ( x - 2 )
y - 2 = - 3 / 2 x + 3
3 x + 2 y - 10 = 0
i did it quickly maybe wrong answer but right way
#48 Help Me ! » whats the remain » 2006-11-20 05:27:25
- RauLiTo
- Replies: 2
a number divided by 7 and the remain is = 3 ... and another number divided by 7 also and the remain is = 5 ... whats the remain when we divide the product of these two numbers by 7 ?
#49 Re: Help Me ! » help !!! » 2006-11-19 23:18:10
thanks man i got it now thanks alot
#50 Re: Help Me ! » help !!! » 2006-11-19 08:23:44
its really clear but i cant see the picture you put so i cant follow your steps