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Fibonacci series

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Conversion between number bases

Converter allows you to convert numbers between number bases - binary (binary), trójkowym, czwórkowym, Friday, szóstkowym, siódemkowym, octal (octal), dziewiątkowym, decimal (decymalnym) jedenastkowym, dwunastkowym, trzynastkowym, czternastkowym, piętnastkowym, hexadecimal (hex). Typed characters that are not numbers and the letters A, B, C, D, E, F are ignored.      
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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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Verifier numbers EAN-13 preview

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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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Verification ISBN preview

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Calculator allows you to verify the ISBN number entered.
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Calculates the effective date of the act, published in the official journal.                  
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Calculator notary fees in Poland

Calculator allows you to calculate the amount of fees that have to be incurred by a notary and an intermediary for the purchase of real estate.