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Print a crude ASCII art plot of the SymPy expression 'expr' (which
should contain a single symbol, e.g. x or something else) over the
interval [a, b].
Examples
========
>>> from sympy import Symbol, sin
>>> from sympy.plotting import textplot
>>> t = Symbol('t')
>>> textplot(sin(t)*t, 0, 15)
14 | ...
| .
| .
| .
| .
| ...
| / . .
| /
| / .
| . . .
1.5 |----.......--------------------------------------------
|.... \ . .
| \ / .
| .. / .
| \ / .
| ....
| .
| . .
|
| . .
-11 |_______________________________________________________
0 7.5 15
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