Math - Cheat Happens General Discussions Message Board (Page 1)

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 MESSAGE BOARDS >> GENERAL DISCUSSIONS Math

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 skittles234 send PM view profile add to friends User #: 236940 Posts: 306 Joined: May 12, 2007 Last visit: Oct 02, 2011
 Posted: Oct 07, 2010 7:29:42 PM - Report post (0) (0) post reply
 So I was bored one day in math class (Calc ab) and as many people do I pulled out my trusted TI-83 and was graphing random things. And I came across an enigma.I graphed "log(X)/sin(x^cos(X))" (in radians) with the window set to "Xmin=0Xmax=10"I then set the window to normal (Xmin=-10) and I got an error. And I thought why? Because the log of a negative doesn't exist, so I graphed "log(abs(X))/sin(X^cos(X))" with the window set to normal. It gave me the same errorSo after a little bit of work, I discover that when X=-1 (for example) sin(-1^cos(-1)) = -.115+.904i so that made sense. But shouldn't the same thing happen after X=2pi? Any explanation would help greatly.
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 DABhand send PM view profile add to friends User #: 157287 Posts: 5262 Joined: Aug 27, 2006 Last visit: Jul 31, 2014
 Posted: Oct 08, 2010 6:14:55 PM - Report post (0) (0) post reply
 Maybe it was because you can actually divide by 0 with that equation, and we all know it means the end of the universe if you try.
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 Neo7 send PM view profile add to friends User #: 475 Posts: 8023 Joined: Jan 17, 2004 Last visit: Jul 31, 2014
 Posted: Oct 13, 2010 7:18:10 AM - Report post (0) (0) post reply
 Set the domain for 0 >= x >= 2*piDivision by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.[Edited by Neo7, 10/13/2010 7:19:56 AM]
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 TalonKarde send PM view profile add to friends User #: 839052 Posts: 734 Joined: Oct 28, 2009 Last visit: Jul 18, 2014
 Posted: Oct 13, 2010 7:58:58 AM - Report post (0) (0) post reply
 jimmy buffet said it best in the song of the same name "Math Sucks."
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 skittles234 send PM view profile add to friends User #: 236940 Posts: 306 Joined: May 12, 2007 Last visit: Oct 02, 2011
 Posted: Oct 13, 2010 1:56:57 PM - Report post (0) (0) post reply

 quote: originally posted by Neo7:Set the domain for 0 >= x >= 2*piDivision by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.[Edited by Neo7, 10/13/2010 7:19:56 AM]

But that's the thing, it lets you graph the equation even when the domain is set to 0>=x>=10, rather than 0>=x>=2*pi. The only time it doesn't let you is when the domain is -10>=x>=10.

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 Toastman send PM view profile add to friends User #: 201294 Posts: 1009 Joined: Feb 04, 2007 Last visit: May 28, 2014
 Posted: Oct 14, 2010 8:48:35 AM - Report post (0) (0) post reply

quote:
originally posted by skittles234:

 quote: originally posted by Neo7:Set the domain for 0 >= x >= 2*piDivision by zero shouldn't matter when graphing an equation as the calculator will either insert a hole or an asymptote where the equation would be undefined. It doesn't know now to deal with non-real values though.[Edited by Neo7, 10/13/2010 7:19:56 AM]

But that's the thing, it lets you graph the equation even when the domain is set to 0>=x>=10, rather than 0>=x>=2*pi. The only time it doesn't let you is when the domain is -10>=x>=10.

Ugh. I understand what you're talking about. This isn't good. College is learning me things.

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