/sci/ - Science & Math » Thread #10955742

2MiB, 2863x1913, 20190908_205944.jpg

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Anonymous Sun 08 Sep 15:01:55 2019 No.10955742 View Reply Original Report

Quoted By: >>10955749 >>10955773 >>10955901 >>10956384 >>10959393 >>10959407

need help /sci/ , what to do next? I'm a noob

Anonymous

Anonymous Sun 08 Sep 2019 15:08:16 No.10955749 Report

Quoted By: >>10955751

>>10955742
Nigga, what is the variable of interest? u or x

Anonymous

Anonymous Sun 08 Sep 2019 15:09:29 No.10955751 Report

Quoted By:

>>10955749
> x ,nigga

Anonymous

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Anonymous Sun 08 Sep 2019 15:12:56 No.10955761 Report

Quoted By: >>10958105 >>10959420

here's the question.

Anonymous

Anonymous Sun 08 Sep 2019 15:18:46 No.10955773 Report

Quoted By: >>10955780

>>10955742
why are you switching between x and n all the time? wtf is this notation? two variables?

Anonymous

Anonymous Sun 08 Sep 2019 15:22:25 No.10955780 Report

Quoted By: >>10955820

>>10955773
my handwriting is bad man ..

integration of ((e^(3x)+e^(5x))/(e^x+e^(-7x)) dx . this is the question

Anonymous

Anonymous Sun 08 Sep 2019 15:36:42 No.10955820 Report

Quoted By:

>>10955780
Please make a conscious decision to fix it.

Anonymous

Anonymous Sun 08 Sep 2019 16:09:10 No.10955901 Report

Quoted By:

>>10955742
Are you the guy I helped with the limits problem last week? Cmon man, do your own homework.

Anonymous

Anonymous Sun 08 Sep 2019 16:14:01 No.10955918 Report

Quoted By:

The fuck are you doing man, just substitute

$e^{u} = x$

which trivializes the integral into literal elementary school divison

Anonymous

Anonymous Sun 08 Sep 2019 18:24:28 No.10956357 Report

Quoted By:

is the answer 1/4(exp(4x) + 1/2 (exp(2x)) -1/4 arctan(4x)

Anonymous

Anonymous Sun 08 Sep 2019 18:25:42 No.10956358 Report

Quoted By: >>10956379 >>10958113

is the answer 1/4(exp(4x) + 1/2 (exp(2x)) -1/4 arctan(exp(4x))

Anonymous

Anonymous Sun 08 Sep 2019 18:32:42 No.10956379 Report

Quoted By:

>>10956358
jesus fuck man, this is beyond pathetic

Anonymous

Anonymous Sun 08 Sep 2019 18:34:12 No.10956384 Report

Quoted By:

>>10955742
u=e^(4x)

Anonymous

Anonymous Mon 09 Sep 2019 07:50:39 No.10958105 Report

Quoted By:

>>10955761
unless this is the only exercise you're given, there is no way they would give you this, unless you're missing something based on the specific course.

the integration of this is insanely long.

Anonymous

Anonymous Mon 09 Sep 2019 07:55:25 No.10958113 Report

Quoted By:

>>10956358
is this answer correct or not

Anonymous

Anonymous Mon 09 Sep 2019 08:26:23 No.10958135 Report

Quoted By: >>10958154 >>10959933

Use wolfram, you are gonna get an insanely long answer.

Anonymous

Anonymous Mon 09 Sep 2019 08:56:53 No.10958154 Report

Quoted By: >>10959933

>>10958135
this. that integral is nasty. do not attempt by hand

Anonymous

Anonymous Mon 09 Sep 2019 19:14:52 No.10959393 Report

Quoted By:

>>10955742
just put u=ln(v) and the whole thing turns into polynomes. You can then simplify the fraction by doing an euclidean division

Anonymous

Anonymous Mon 09 Sep 2019 19:22:48 No.10959407 Report

Quoted By:

>>10955742
wtf are those u's in the numerator or x's

Anonymous

Anonymous Mon 09 Sep 2019 19:28:09 No.10959420 Report

Quoted By:

>>10955761
You would have to substitute u=e^x, then you'll arrive at fraction with polynomials both upstairs and downstairs. You'll have to hit it with partial fractions after that. Then you'll end up in an insanely large answer.

Anonymous

Anonymous Mon 09 Sep 2019 22:45:53 No.10959933 Report

Quoted By:

>>10958135
>>10958154
wolfram is not going to solve this. at best it will give you a numeric solution of some improper integral if it converges. it is an NP hard problem

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