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Verification of the ISSN

Calculator allows you to verify the number entered ISSN (International Standard Serial Number serial publication). FAQ: How ISSN number?              

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Verification ISBN preview

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Calculator allows you to verify the ISBN number entered.
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Verification of the social security number in Poland

It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
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Weighted average ratings

The calculator calculates the weighted average of the ratings of the following items.              
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Number of wallpapers

Jak oszacować niezbędną ilość tapety?
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Calculator to estimate the necessary amount of wallpaper needed to wytapetowania room of the given dimensions.    
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Health

Iron deficiency

The calculator calculates the dose of iron necessary to adopt a parenteral route to compensate for the normal level of the common deficiency.      
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Trigonometric functions calculator

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