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The calculator calculates the circumference of an ellipse for a given length of the axis passing through it.    

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Weighted average ratings

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Conversion between number bases

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Trigonometric functions calculator

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.
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Calculator anion gap

Calculator to the data calculates the anion gap. http://pl.wikipedia.org/wiki/Luka_anionowa                  
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Calculator on the basis of the given air temperature and wind speed are calculated wind-chill effect.              
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Calculator floor panels

Calculator based on the dimensions of the area to put the panels and occupancy data on number of panels in one package, calculate how much you have to buy packages of panels to cover the entire room.                          
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Statistical calculator

Calculator allows to determine the basic statistical parameters such as standard deviation, arithmetic mean, variance, and median for the values.