Updates:
        Labels: -CodeInDifficulty-Easy -EasyToFix CodeInDifficulty-Medium

Comment #3 on issue 2784 by pr...@goodok.ru: 1/function() should be printed differently by latex printer
http://code.google.com/p/sympy/issues/detail?id=2784

It is not ease to fix, because it is related with "medium" issue 2552

In [1]: 1/cos(x)
Out[1]: 1/cos(x)

In [2]: (1/cos(x)).args
Out[2]: (cos(x), -1)


issue 2552: substitution does not work for (1/(x*y)).subs(x*y, 2) because :

In [15]: a = 1/(x*y)

In [16]: a.args
Out[16]:
⎛1  1⎞
⎜─, ─⎟
⎝x  y⎠


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