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Mathematics: Post your doubts here!

biba

biba

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AsadZaidi said:
guys i m stuck on m/j 2004 q10 part c... the integration one.... plz help...
Click to expand...
y= lnx/x^2...
we have to use integration by parts ..
u = lnx so du/dx=(1/x)
dv/dx=(1/x^2) so, integral of v=(-1/x)
(i am using ! as the sign of integral)
the formula is: !u(dv/dx) = uv - !v(du/dx)
= lnx(-1/x) - ! (-1/x)(1/x)
= -lnx/x + ! (1/x^2)
obtain the second integral:
= (-lnx/x) - (1/x)
the limits are x=e and x = 1
now u can put in the limits and obtain the answer (y) !
 
iKhaled

iKhaled

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hey ppl..when a plane passes through a point lets say for example point A..what will be the relation between the plane and the point it has passed ?
 
applepie1996

applepie1996

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nigga7

nigga7

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in a geomatric progressionthe second term is 9 less than the first term.the sum of the second and thirdterm os 30,given that all termsi the progression are positive,find the first term..... NEED HELP HERE GUYS :)
 
Esme

Esme

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Silent Hunter said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s03_qp_3.pdf

how to do these type of questions? e.g the question7 (iii) ..... theres some kind of infinity thing i guess

any rules regarding these questions?

Rutzaba
applepie1996
Esme
biba

or anyone ?
Click to expand...

That's what I do too. :)

applepie1996 said:
yeap (y)
okay not exactly :p
just put in a very large t value like 1000 or something
and you get what x converges to :)
Click to expand...
 
Esme

Esme

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iKhaled said:
hey ppl..when a plane passes through a point lets say for example point A..what will be the relation between the plane and the point it has passed ?
Click to expand...

This means the point is lying in the plane, so when you substitute the point in the equation of the plane, it should be satisfied.
That's the only relation I could think of right now
 
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