in discussion Hidden / Per page discussions » Power Seller College Newbie

Hello everyone, I just joined the forum. I have seen a lot of interesting stuff here. I hope to be able to participate in discussions and offer my input as well!

Cheers!

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Power Seller Center (guest) 06 Nov 2013 00:43

in discussion Hidden / Per page discussions » Power Seller College Newbie

in discussion Hidden / Per page discussions » Power Seller College Newbie

Hello everyone, I just joined the forum. I have seen a lot of interesting stuff here. I hope to be able to participate in discussions and offer my input as well!

Cheers!

powercolor 08 Aug 2012 03:04

in discussion Hidden / Per page discussions » Power Seller College Newbie

in discussion Hidden / Per page discussions » Power Seller College Newbie

**Hello all, just joined the forum. Saw a lot of interesting stuff here and maybe I'm able to share some too along the way

Cheers!**

chinney 28 May 2012 03:08

in discussion Hidden / Per page discussions » Newbie Lysco Chimney here..:))

in discussion Hidden / Per page discussions » Newbie Lysco Chimney here..:))

I am Lysco Chimney….

Well let me tell you all about my self.

I am a fun loving, cheerful girl who takes every responsibility seriously, loves watching movies, reading books and playing games on PS3.

Umm, well I guess thats sufficient for the time being,

Lemme know about you all :)

Thank you for reading

Lysco Chimney

Thanks for following up and sharing the answer to your question.

When one attempts to plot the graph of hyperbolic cosine, we see a graph that passes through the origin, which is not correct if the graph is done on the real plane. I can't tell if the program is graphing using complex values or not; any thoughts?

Steve

Bruce Yoshiwara (guest) 22 Jun 2009 17:39

in discussion Hidden / Per page discussions » Elem Algebra

in discussion Hidden / Per page discussions » Elem Algebra

The query "y=5+3x" will result in two graphs, the first of which appears to show a line with negative vertical intercept.

The truth is that the vertical line marked with the vertical scale is not the y-axis, but x=-1.69.

The query "y=5+3x, x from 0 to 10" will result in a single graph that appears to show a line through the origin, but in this case the horizontal line marked with the horizontal scale is not the x-axis, but y=5.

Although I recognize that graphs often do not show the axes, I'd like a soft introduction for my developmental students.

How do we force W|Alpha to put the "AxesOrigin" at (0,0)?

If you enter

1/(2+cos(x))

at W|Alpha, you get a couple of things worthy of discussion. The first is that both graphs appear to drop below the x-axis (which would be surprising for a function that is always positive), until you notice that the horizontal line showing the scale is not the x-axis at all but y = 0.4.

The fun part for Calculus is that, because the given continuous function is positive everywhere, its anti-derivative is increasing (and differentiable) for all values of x. However, the given expression for the indefinite integral (in W|Alpha or any other CAS using the Risch algorithm) is periodic: f(x + 2pi) = f(x).

And no continuous periodic function is increasing everywhere.

`1,x<0},{2,x>0`] from -1 to 5 does the job very easily. (But I learned this using Jay's form as a starter.) However this fails if Piecewise is not capitalized. I sent a suggestion in this direction to W|A.

Piecewise function can be entered using Mathematica syntax, for example,

http://www54.wolframalpha.com/input/?i=Piecewise%5B%7B%7B1%2Cx%3C0%7D%2C%7B2%2Cx%3E0%7D%7D%5D

and then it can do integrate, etc, using this

but there should be better way….

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