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The harmonic mean

Calculator based on the entered numbers separated by commas calculate the harmonic mean.        

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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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Verification ISBN preview

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Calculator allows you to verify the ISBN number entered.
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Molar concentration of mass and volume

Calculator allows to determine the molar concentration of the solution.            
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Calculator on the basis of the given air temperature and wind speed are calculated wind-chill effect.