ycb_sympy_pr21612

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Latex parsing of fractions yields wrong expression due to missing brackets
Problematic latex expression: `"\\frac{\\frac{a^3+b}{c}}{\\frac{1}{c^2}}"`

is parsed to: `((a**3 + b)/c)/1/(c**2)`.

Expected is: `((a**3 + b)/c)/(1/(c**2))`. 

The missing brackets in the denominator result in a wrong expression.

## Tested on

- 1.8
- 1.6.2

## Reproduce:

```
root@d31ef1c26093:/# python3
Python 3.6.9 (default, Jan 26 2021, 15:33:00)
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from sympy.parsing.latex import parse_latex
>>> parse_latex("\\frac{\\frac{a^3+b}{c}}{\\frac{1}{c^2}}")
((a**3 + b)/c)/1/(c**2)

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