Student asking for help(simple stuff)
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How can I do following in matlab?
1)Draw the graph of the function y = tan (x) / x dotted red in the interval (-3.3) with a hundred points
2)Find the roots of polynomials y =-3x^3+4x^2-x+3
3)Solve the system of equations:
x-y+2z=1
x-2y-z=2
3x-y+5z=3
4) Find a graph of the function y= (xe^-x)/1-e^x,,,,,,,,,on intervale(-5.5) with step 00:01
Any help with this would be highly appreciated, thanks in advance.
Regards.
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Shashank Prasanna
2013-1-30
编辑：Shashank Prasanna
2013-1-30
Sounds like an assignment. Please read the getting started guide. And use the doc heavily.
3) Do you want to vizualize? what do you want to do when you say find a graphs? Use plot again just to observe.
Hint for 1:
x = linspace(-3,3,100);
plot(x,tan(x)./x,'r.');
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