# Maxima - help

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1. Nov 1, 2015

### daviodan

1)I use Linux Mint 17.2 and wxMaxima 13.04.2. In wxMaxima 13.04.2, the code below, It plays correctly:
plot2d([x,x^3,[discrete,[[0,0],[1,1],[-1,-1]]]],[x,-5,5],[y,-5,5],
[style,[lines,2,1],[lines,2,4],[points,3,2]],[point_type,bullet],
[legend,"x","x^2",""],[xlabel, "x"], [ylabel, "y"],[label,["A(1,1)",1.2,1],["O(0,0)",0.1,-0.1],["C(-1,-1)",-1,-1]],
grid2d,[ytics, 0,1,3], [xtics, 0, 1, 3],
[title, "Graphic"],[axes, solid]),
plot_size=[500,500];

On http://maxima-online.org/ ,I receive many errors for this code. Why?
Thanks.

2)How do I verify that the result of product prod(1-1/(k^2),k,2,n) is (n+1)/(2*n)?

is(prod(1-1/(k^2),k,2,n)=(n+1)/(2*n));
false
Why?

3)I use wxMaxima 13.04.2 on Linux Mint 17.2. When I type the command:

A:matrix([1,2,3],[4,5,6],[7,8,8]);invert(A);

http://oi65.tinypic.com/rvg0gn.jpg

http://maxima-online.org/?inc=r1224065787#?in=A:matrix(%5B1%2C2%2C3%5D%2C%5B4%2C5%2C6%5D%2C%5B7%2C8%2C8%5D)%3B%0A%0Ainvert(A)
Maxima-online.org and Maxima on Android not have this issue.
Thanks.

2. Nov 6, 2015