Fix Equation

Author: hlouzada

README.md

@@ -6,7 +6,7 @@ Small library (currently only one class) for uncertainty calculations and error
 
 The uncertainty calculations are in accordance with gaussian’s propagation, as calculated by an analytical method:
 
-$$\Delta_f = \sqrt{\left(\frac{\partial f}{\partial x}\right)^2{\Delta_x}^2 + \left(\frac{\partial f}{\partial y}\right)^2{\Delta_y}^2 + \left(\frac{\partial f}{\partial z}\right)^2{\Delta_z}^2 + ...}$$
+![equation](https://latex.codecogs.com/png.latex?%5Cdpi%7B120%7D%20%5CDelta_f%20%3D%20%5Csqrt%7B%5Cleft%28%5Cfrac%7B%5Cpartial%20f%7D%7B%5Cpartial%20x%7D%5Cright%29%5E2%7B%5CDelta_x%7D%5E2%20+%20%5Cleft%28%5Cfrac%7B%5Cpartial%20f%7D%7B%5Cpartial%20y%7D%5Cright%29%5E2%7B%5CDelta_y%7D%5E2%20+%20%5Cleft%28%5Cfrac%7B%5Cpartial%20f%7D%7B%5Cpartial%20z%7D%5Cright%29%5E2%7B%5CDelta_z%7D%5E2%20+%20...%7D)
 
 Made by and for Physics Laboratory students in IFSC, who can't use uncertainties.py because of mean’s absolute deviation used in its calculation.
 
@@ -60,4 +60,4 @@ pip install git+https://github.com/phisgroup/labfis.py/tree/development
  10. ["Propagation of Uncertainty through Mathematical Operations"](http://web.mit.edu/fluids-modules/www/exper_techniques/2.Propagation_of_Uncertaint.pdf)  (PDF). p. 5. Retrieved  2016-04-04. 
  11. ["Strategies for Variance Estimation"](http://www.sagepub.com/upm-data/6427_Chapter_4__Lee_%28Analyzing%29_I_PDF_6.pdf)  (PDF). p. 37. Retrieved  2013-01-18.
  12. Harris, Daniel C. (2003), [_Quantitative chemical analysis_](https://books.google.com/books?id=csTsQr-v0d0C&pg=PA56)(6th ed.), Macmillan, p. 56, [ISBN](https://en.wikipedia.org/wiki/ISBN_(identifier) "ISBN (identifier)")  [978-0-7167-4464-1](https://en.wikipedia.org/wiki/Special:BookSources/978-0-7167-4464-1 "Special:BookSources/978-0-7167-4464-1")
- 13. ["Error Propagation tutorial"](http://www.foothill.edu/psme/daley/tutorials_files/10.%20Error%20Propagation.pdf)  (PDF).  _Foothill College_. October 9, 2009. Retrieved  2012-03-01.
+ 13. ["Error Propagation tutorial"](http://www.foothill.edu/psme/daley/tutorials_files/10.%20Error%20Propagation.pdf)  (PDF).  _Foothill College_. October 9, 2009. Retrieved  2012-03-01.