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Author Topic: INTEGRATION QUESTIONS!  (Read 2387 times)

Offline SGVaibhav

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INTEGRATION QUESTIONS!
« on: December 26, 2009, 03:22:55 pm »
i did not know where to post this topic, so i posted it in both places
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Guys i have many doubts in integration
i will not be posting them, because they r quite long, so leave those.

now i will put a small doubt that i have.

im posting it in a pic


i do not understand how does the number which comes out is 2??
the number which comes out is supposed to be 4 actually ???

the stuff  // steps i have written is 100 % correct ...

HOW HOW HOW ???

please help fast, because i have a test coming up, and this concept will affect the stuff i learn after this
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Offline astarmathsandphysics

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Re: INTEGRATION QUESTIONS!
« Reply #1 on: December 26, 2009, 05:05:08 pm »
here
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Offline SGVaibhav

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URGENT SMALL QUESTION!! URGENT URGENT !! SMALL QUESTION BUT URGENT!!
« Reply #2 on: December 27, 2009, 04:41:51 pm »
confused about integral of  ( x / x^2)

getting 2 answers
posted a picture below...


plz i have a exam tom, and i am waiting for a reply
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Offline XFlufferzX

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Re: INTEGRATION QUESTIONS!
« Reply #3 on: December 27, 2009, 05:46:29 pm »
Yeahh both of yur answers are correct
according to this rule:

Log x^k is equal to  =  k log x
eg:

Log x^2 is the same as 2 Log x

As is ur question its 1/2 ln x^2

is the same as  ln x

Because when you multiply 2 by 0.5 it gives you 1 -----> ln x

Good luck!!!
« Last Edit: December 27, 2009, 05:48:04 pm by XFlufferzX »
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Offline SGVaibhav

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Re: INTEGRATION QUESTIONS!
« Reply #4 on: December 27, 2009, 05:49:51 pm »
ok 2 more questions

1) so can this thing be simplified ?? ------->        0.5  ln |x^2 + 3|                (half  x   ln absolute value of |x square + 3|)
2), im scannign and im posting
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Offline SGVaibhav

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Re: INTEGRATION QUESTIONS!
« Reply #5 on: December 27, 2009, 05:56:49 pm »
1 question expresseed clearly
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Offline SGVaibhav

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Re: INTEGRATION QUESTIONS!
« Reply #6 on: December 27, 2009, 06:01:55 pm »
2nd question

i had a same question
i tried in 2 different ways
i got different answers

and i also checked the answer in the net, and i found a different answer that way also ....
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Offline SGVaibhav

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Re: INTEGRATION QUESTIONS!
« Reply #7 on: December 28, 2009, 04:42:21 pm »
ok i got the answer :D
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Offline XFlufferzX

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Re: INTEGRATION QUESTIONS!
« Reply #8 on: December 28, 2009, 06:09:34 pm »
Dats awehsooome! cuz I havent took dat part of integration yet.. :o
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