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Mathematics: Post your doubts here!

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1357913579

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Mustehssun Iqbal said:
Some method of recognizing which one is u and which one v dash in integration by parts...
Suppose there's lnx.x and you've to integrate it.
There you have a logarithm and airthematic value. So in the word " L A T E " L (logarithm ) comes first and A(airthematic ) comes after it. So lnx(logarithimic ) is u and x(airthmatic ) is vdash.
Another example: Suppose there is cosx.2x and you have to integrate it by parts. There is one airthematic term and the other one trignometric term. In "L A T E " , A (airthemitc) comes before T (trignometric ) . So 2x becomes u and cosx becomes vdash. The letter that comes first is u and the one that comes after it is vdash.
Click to expand...
I use the same bro its called ILATE I for inverse
 
Mustehssun Iqbal

Mustehssun Iqbal

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1357913579 said:
I use the same bro its called ILATE I for inverse
Click to expand...
great :)
btw what's inverse?? Does it come in questions??
smzimran said:
Oh, thats a good strategy but i never need help in that i am always able to decide that but that may come of aid, so i will memorise it!
(y)
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then how else were you doing these questions??
waoww I knew something in Maths that you didn't. feels honoured :D
 
Aarjit

Aarjit

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smzimran said:
Whats this ?
LAte and stuff, never heard of it !
Click to expand...

:eek: Seriously? try "I LATE" (think that you're always late at learning maths! ;))

in ∫ u.v'(x)dx = u.v − ∫ u'(x).v dx,"u" will take the expression in the following oder:
a
I - Integration (~ by parts)
L - Logarithmic (e.g. lnx, logx)
A - Algebraic (e.g. x^2, 2x)
T - Trigonometric (tanx, secx)
E - Exponential (e^x)
 
smzimran

smzimran

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Aarjit said:
:eek: Seriously? try "I LATE" (think that you're always late at learning maths! ;))

in
54cae0cd14e5f95ce42a473b7753b4ec.png
,"u" will take the expression in the following oder.
I - Integration
L - Logarithmic (e.g. lnx, logx)
A - Algebraic (e.g. x^2, 2x)
T - Trigonometric (tanx, secx)
E - Exponential (e^x)
Click to expand...
Haha, got it!
Thanks
:D
 
smzimran

smzimran

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Mustehssun Iqbal said:
great :)
btw what's inverse?? Does it come in questions??

then how else were you doing these questions??
waoww I knew something in Maths that you didn't. feels honoured :D
Click to expand...
I could easily figure out which to take as u
I solved ten years papers never had any problems!
Thats great iam happy you had this 'honour'
:LOL:
 
smzimran

smzimran

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hassam said:
no....it was other way around.....bt dont knw what its purpose and use in questions....
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I have quoted from the notes, it is correct, but yes never found it purposeful so forget it,
Btw hows prep? and u giving 32 ?
 
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hassam

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yea 32 As the series is infinite it can only converge if -1 < x < 1
By the ratio test, it follows that the series converges for |x|<1, diverges for |x| > 1.​
 
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