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20151103 07:53:23 0600  asked a question  Graphing 3 planes Disclaimer: I'm new to linear algebra and an intermediate with Sage. How can I graph the following planes? This example is taken from Linear Algebra and Its Applications by Strang. I've tried to follow these instructions, but I'm stuck. Thanks!

20150924 10:49:42 0600  commented answer  Graph or plot a system of inequalities This is a clever solution. I didn't know you could use the solver with rhs and plot to graph relations. The problem is that it doesn't shade the inequality's region like region_plot does. 
20150924 10:47:48 0600  commented answer  Graph or plot a system of inequalities You beat me to it. I was going to suggest: 
20150924 07:34:10 0600  asked a question  Graph or plot a system of inequalities Disclaimer: I'm somewhat new to Sage. Is it possible to graph a system of inequalities in Sage? I'd like to reproduce the following system (top of image) and its graph (bottom of image). Based on (http://www.sagemath.org/tourgraphics...), it seems like I need a region plot, but I'm not sure. 
20150805 18:57:59 0600  asked a question  How to plot a parabola (conic): y²=4ax I'm learning about conics, specifically parabolas, and I'd like to plot them. I already know how to do plot(x^2)), but what about y²=4ax ? I understand that representation is a relation, not a function, so that probably eliminates plot(f(x)). But, I'm stuck on how I might plot that socalled "general form" of a parabola. Thanks! 
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20150720 09:02:25 0600  commented answer  Label each point very nice! thank you! 
20150719 01:04:48 0600  asked a question  Label each point Is it possible in Sage to label each point in a 2D plot? I'd like to create something like this: 
20150713 11:04:20 0600  commented answer  Plots: display period information Perfect! It didn't occur to me to use a list comprehension. 
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20150710 16:25:41 0600  asked a question  sin arguments not distributed? In both Wolfram Alpha and Google, I can type the following: 3sin(2(x(pi/4)))+1 and those systems see but when I enter it into Sage Math, it's show(f(x)) indicates as shown here: http://picpaste.com/13llQDTs0.png (sorry, I can't upload images on ask.sagemath.org since I have less than 60 points) which obviously differs from Wolfram Alpha and Google. What am I doing wrong? Thanks! 
20150710 15:32:46 0600  asked a question  Plots: display period information Disclaimer: I'm new to Sage. Is it possible to indicate the period when plotting periodic functions? According to my trig book, for example, "you have a graph that has four complete cycles of the sine curve in the space where you would usually find one", as shown here: Is there a way to indicate each period? If not, could I approximate it with ticks? Something like: 
20150710 14:14:28 0600  marked best answer  Beginner: Plot sin 2x or 4cos 2x Disclaimer: I'm a beginner with Sage. I'm working with transformations and translations of trig functions, and although I can "plot(sin, (2,2))" without trouble, how do I plot the following? or or Thanks! 
20150710 14:14:28 0600  commented answer  Beginner: Plot sin 2x or 4cos 2x Perfect! Thank you for the detail. I was trying sin(2x) not sin(2*x) and getting an error. 
20150710 14:13:17 0600  commented answer  Beginner: Plot sin 2x or 4cos 2x excellent! thank you! 