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<p><it>Abstract—</it>We propose a scheme for evaluating four commonly used functions namely, 1) inverse trigonometric functions, 2) trigonometric functions, 3) the exponential function, and 4) the logarithmic function with the help of a logarithmic number system (LNS) processor. A novel idea of <it>series folding</it> has been introduced for computing the above functions, expressed in the form of infinite series. We also show that with a suitable choice of the radix for the LNS we can evaluate exponential and logarithmic functions without using any extra hardware.</p><p><it>Index Terms—</it>Logarithmic number system, series folding, inverse trigonometric functions, arctangent function, trigonometric functions, exponential function, logarithmic function.</p>

D. Das, B. P. Sinha and K. Mukhopadhyaya, "Implementation of Four Common Functions on an LNS Co-Processor," in IEEE Transactions on Computers, vol. 44, no. , pp. 155-161, 1995.
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