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Number of tetrahedral

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Conversion between number bases

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Trigonometric functions calculator

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Unit Converter glucose (blood sugar)

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Friis transmission equation

The calculator calculates the power at which the antenna receives the signal output from the second antenna of the power and distance greater than a single wavelength. The higher the frequency, the higher the transmission power loss from the signal transmission.        
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The calculator calculates how much radioactive material remains after a certain period of time.      
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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.