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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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The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Calculator average revenue per employee in the company

Calculator on the basis of the specified amount paid salaries and number of employees, calculates the average annual and          
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Calculator VAT refund for building materials

The calculator calculates the amount of VAT that can be refunded in respect of incurred expenses associated with the purchase of construction materials.