calculus help
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Topic: calculus help
Posted By: phillll227
Subject: calculus help
Date Posted: 09 March 2005 at 9:56pm
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for anyone who has taken calc-
S= integral sign i need to evaluate S(sin(x^.5)dx) i know its not likely, but any help is appreciated edit: i'm trying u substitutions and integration by parts double edit: the answer is 2(sin(x^.5)-(x^.5)(cos(x^.5)))+c, i just need to know how to get it ------------- |
Replies:
Posted By: Hysteria
Date Posted: 09 March 2005 at 9:59pm
| Failing Algebra II... |
Posted By: Frozen
Date Posted: 09 March 2005 at 10:02pm
 I'm so glad I didn't take Calculus. |
Posted By: Bauerp0weR 18
Date Posted: 09 March 2005 at 10:06pm
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I'm in Adv Algebra and Trig H... did some of that sin cos stuff last year but i have no idea what an integral sign is or what your solving for... sorry dude ------------- Black Smart Parts Ion Halo B Check-It Unimount macroline 68/45 Pure Energy tank |
Posted By: SeaWolf
Date Posted: 09 March 2005 at 10:23pm
i dont see how they got that... 
it looks like a quotient rule or something... but that's for differentiation, not integrating... grr... u gotta tell me once u figure it out. ------------- 
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Posted By: phillll227
Date Posted: 09 March 2005 at 11:01pm
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I'm still working on it.. I'll keep you updated ------------- |
Posted By: phillll227
Date Posted: 09 March 2005 at 11:13pm
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Well folks, I'm giving up...
2 words screw calc!! ------------- |
Posted By: procarbinefreak
Date Posted: 09 March 2005 at 11:15pm
give me a sec... i'll have an answer for you in a minute... i'm in calc 3 in college  i stand mistaken... unfortunately... we haven't gotten to those kind of integrals... at first glance i though i could do it... sorry! |
Posted By: :ShockeR_ratm:
Date Posted: 09 March 2005 at 11:15pm
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hahahhaha, yea right
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Nobody ever suspects the fun police! 
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Posted By: phillll227
Date Posted: 09 March 2005 at 11:45pm
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I'm still working on it (must be crazy), and I've realized I'm going to have to make some sort of substitution for sin(x^.5) and then use integration by parts, I'm just not sure of the correct way to substitute. All help and any more help is greatly appreciated.
BTW procarbinefreak, this is interesting, I'm only in AP calc AB ------------- |
Posted By: procarbinefreak
Date Posted: 10 March 2005 at 9:41am
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well... our school breaks it up a lot... calc 1 was through
derivatives... calc 2 was through integrals and substitution.
eventually this quarter we'll get into parts... just not as of
yet. I have to take calc 1-4 and differential equations, so there's a lot more for me to learn. and i just don't remember doing integration by parts from last year in high school. |
Posted By: reifidom
Date Posted: 10 March 2005 at 9:56am
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I've had this stuff, but I don't know if I remember enough to be useful to you here. I'm really horrible at the trig stuff because I took pre-calc instead of trig before stepping into calc I. If I had known I would have definetly taken the trig first.
I'll mess with it and if I can come up with anything that might help I'll post it. But please, don't hold your breath. :) ------------- 
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Posted By: phillll227
Date Posted: 10 March 2005 at 3:40pm
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OK i got it..
the key was to set U equal to x^.5, then x=u^2, dx=2udu ------------- |
Posted By: MetallicaESPa5
Date Posted: 10 March 2005 at 3:45pm
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Yeah......i'm in geometry.
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Posted By: SeaWolf
Date Posted: 10 March 2005 at 4:50pm
...would have never thought of that... -------------
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phillll227 wrote: