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Number of tetrahedral

Tetrahedral numbers are the natural numbers, for which it is possible to construct a tetrahedron formnego of bullets. They are a special case of the pyramidal numbers.        


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The calculator calculates the weighted average of the ratings of the following items.              
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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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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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Specifies the basic operation of the two sets
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Waterproofing balconies [IZOHAN]

Calculator allows to determine the price of IZOHAN materials needed to complete the waterproofing of the terrace of the given dimensions.
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Verification ISBN preview

Jak sprawdzić numer ISBN?
Jak zweryfikować numer ISBN?
Calculator allows you to verify the ISBN number entered.
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Gross-Net Calculator prices of goods and services in Poland

Jak obliczyć kwotę brutto z uwzględnieniem podatku VAT? Jak obliczyć kwotę netto z uwzględnieniem podatku VAT?
It allows you to calculate the amount of gross or net price including VAT