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23 / M / Edo, Shinsengumi...
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Posted 7/30/08
Since when was Kondo-san so smart in math?
Sensei
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25 / M
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Posted 7/31/08

Sougo_Okita wrote:

Since when was Kondo-san so smart in math?


How else would i survive from otae-sans attacks?
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24 / F / It's not location...
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Posted 7/31/08
You survived?
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25 / M
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Posted 7/31/08 , edited 7/31/08

Katsura_Kotarou wrote:

You survived?


Of course, because stalkers are invincible....
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24 / F / It's not location...
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Posted 7/31/08

fruitschinposamurai wrote:


Katsura_Kotarou wrote:

You survived?


Of course, because stalkers are invincible....


ah, no argument on that * Immediately thinks about "Elizabeth-chan" *
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27 / M / I'd tell you... b...
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Posted 8/20/08
Wow, it's almost been a month since someone has been here... does anyone even use this room anymore???
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25 / M
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Posted 8/20/08
It felt like yesterday when I was last here.........
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28 / F / home....I guess...
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Posted 8/20/08
haha...i think i've been in here once.....
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26 / working....
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Posted 8/21/08
hmmmmm...i thought this is the math class so what are you guys talking about??

ok i have a question:

can someone explain me why cos(x) is the derivative of sin(x)

thanks
Student
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34 / M / Netherlands
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Posted 8/21/08

hijitaka wrote:

hmmmmm...i thought this is the math class so what are you guys talking about??

ok i have a question:

can someone explain me why cos(x) is the derivative of sin(x)

thanks


derivate ?
Student
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34 / M / Netherlands
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Posted 8/21/08
fi you mean why (x) becomes lower then try typing : shift +(cos/sin) + (x) then it become bigger
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25 / M
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Posted 8/21/08

hijitaka wrote:

hmmmmm...i thought this is the math class so what are you guys talking about??

ok i have a question:

can someone explain me why cos(x) is the derivative of sin(x)

thanks


Use the difference quotient
f`(x)=(f(x+deltax)-f(x))/deltax
so it would be (sin(x+deltax)-sin(x))/deltax
then it would become
(sin(x)cos(deltax)+sin(deltax)cos(x)-sin(x))/deltax
factor
sin(x)((cos(deltax)-1)/deltax)+cos(x)((sin(deltax)/deltax)
the limit as deltax goes to zero of (cos(deltax)-1)/deltax is zero
and the limit as deltax goes to zero of sin(deltax)/deltax is 1
so the first term is eliminated and we are left with cos(x).
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Posted 8/21/08 , edited 8/21/08

claw836 wrote:

fi you mean why (x) becomes lower then try typing : shift +(cos/sin) + (x) then it become bigger


What are you talking about? Hijikata is speaking of the derivative of sin(x), which is the slope of the line tangential to any point on the function sin(x)
Student
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34 / M / Netherlands
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Posted 8/21/08 , edited 8/21/08
yo, could ya just post the mat problem ya have ? cous numbers make more sens then letter here .. btw wat fruit peep said was like = bullcrap or almost right ... just post the math problem plox
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Posted 8/21/08
Taichou,can you give me some tips in doing Alge-BRA?
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