From Lectisoft :
Lincalc is a console calculator for evaluating algebraic, logarithmic, and trigonometric equations. It is designed to provide a quick and simple interface to a very powerful calculator. Its parser is based on the muParser engine . It supports user-defined variables, logical operators for conditions, and a wide range of mathematical functions each calculation that is made is stored in a result variable (Ans1, Ans2..) and can be referenced in equations. It also supports evaluation of multiple equations each separated by a ','.Functions include abs, exp, sqrt, avg, sum, min, max, sign, rint, ln, log10, log2, sin, sinh, asin, asinh, cos, cosh, acos, acosh, tan, tanh, acos, acosh.