Description:
Bad calculation of exponents, x^n provides the same result as -x^n.

Steps to Reproduce:
1. Put a number into a cell in LO Calc, e.g. "6" in cell A1.
2. In another cell, try to calculate relation "=-A1^2".
3. The result should be -36, LO Calc gives 36.

Actual Results:  
The LO Calc calculates the relation as if parentheses were present, for -A1^2, where A1=6 it gives 36, which is incorrect.

Expected Results:
It is expected to first process the power operation, then addition of sign.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
See these relations, they are not the same, yet LO processes them identically:

1. -x^n
2. (-x)^n

The first expression should be processed as -(x^n), not as the second one. Just check the same relations in e.g. GNU/Octave.


User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.98 Safari/537.36