Winamp Forums Derivative help

 8th June 2004, 01:31 #1 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 Derivative help I know that the derivative os cos(4x) is -4sin(4x). . .so does that mean that you just take the four out and put it in front of the derivative of cos? And i can't figure out for anything how to do 3xsin(3x) Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
 8th June 2004, 01:43 #2 cyu Major Dude     Join Date: Apr 2002 Location: in front of my pc Posts: 1,617 (3x)(derivative of sin(3x))+(sin3x)(3) I took calc last year.
 8th June 2004, 01:44 #3 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 that doesn't help because i get stuck on derivative of sin(3x) edit/ is 3sin(3x) + 9xcos(3x) the final answer? Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
 8th June 2004, 01:58 #4 cyu Major Dude     Join Date: Apr 2002 Location: in front of my pc Posts: 1,617 Yep. looks right.
 8th June 2004, 02:01 #5 griffinn Court Jester (Forum King)     Join Date: May 2000 Location: Your local toystore Posts: 3,502 ```code: d (3x sin 3x) / dx = [d(3x) / dx] * [d (3x sin 3x) / d(3x)] = 3 * { 3x [d(sin 3x)]/d(3x) + sin 3x * [3x/d(3x)] } = 3 * ( 3x cos 3x + sin 3x ) = 9x cos 3x + 3 sin 3x```So yeah, it's correct. The smiley slot machine! | Quotable Blog
 8th June 2004, 02:10 #6 ElChevelle Moderator Alumni     Join Date: Jun 2000 Location: the MANCANNON! Posts: 22,431 I concur.
 8th June 2004, 02:17 #7 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 something like x(2sinxcosx) becomes 2xsinxcosx right? why is only the 2 multiplied by the x? Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
 8th June 2004, 02:19 #8 griffinn Court Jester (Forum King)     Join Date: May 2000 Location: Your local toystore Posts: 3,502 That's the associative property of multiplication. Basic algebra. The smiley slot machine! | Quotable Blog
 8th June 2004, 02:22 #9 deeder7001 Jesus Freak(Forum King)     Join Date: Aug 2002 Location: Austin, TX Posts: 5,455 i don't remember how to do advanced math anymore. it's been about a year since i've been in a math class. There is no sig.
 8th June 2004, 02:23 #10 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 thanks guys. once again, basic algebra ruins an otherwise correct problem Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
8th June 2004, 02:25   #11
cyu
Major Dude

Join Date: Apr 2002
Location: in front of my pc
Posts: 1,617
Quote:
 Originally posted by k_rock923 something like x(2sinxcosx) becomes 2xsinxcosx right? why is only the 2 multiplied by the x?
are you talking about the derivative of that?

 8th June 2004, 02:30 #12 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 no. that was part of the answer to xsinsquaredx so it was x(2sinxcosx)+(sin squared x)1 and that turned into 2xsinxcosx + sin^2 x if that's wrong, please tell me. Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
 8th June 2004, 02:56 #13 ryan not fucked, not quite. (Forum King)     Join Date: Feb 2002 Location: Tn Posts: 8,755 Ask in the AVS forums, they could most likely help.
 8th June 2004, 02:59 #14 griffinn Court Jester (Forum King)     Join Date: May 2000 Location: Your local toystore Posts: 3,502 Sssshhhh... he's got it right, but we're not supposed to tell him! /me hides The smiley slot machine! | Quotable Blog
 8th June 2004, 03:59 #15 Hollow Major Dude     Join Date: Oct 2001 Location: Baker Lab, Ithaca NY Posts: 1,128 k_rock, look up the chain rule in your book. If you don't get it from the book, find someone to show you how it works until you get it. Have random people tell you if you got one question right without understanding the mechanism is wasting your time and ours. The moon is made of cheese. Oh for some tasty moon cheese. www.redtetrahedron.org
 8th June 2004, 19:51 #16 k_rock923 \m/(Forum King)     Join Date: Jul 2003 Location: /bin/bash Posts: 7,786 hollow, thats how i solved it. i'm just making sure that i did it right. thanks though. Never underestimate the bandwidth of a station wagon full of tapes hurtling down the highway.
 Winamp Forums Derivative help