Simple utility to calculate math expressions. Available functions are :
COS, SIN, SINH, COSH, TAN, COTAN, ARCTAN, ARG,EXP, LN, LOG10, LOG2, LOGN, SQRT, SQR, POWER, INTPOWER,MIN, MAX, ABS, TRUNC, INT, CEIL, FLOOR , RANDOM and
SIGN (sign(x) is 1 for x>1, 0 for x=0, -1 for x<0),
ZERO (zero(x) is 0 for x=0, 1 for x<>0),
HEAV (heav(x) is =1 for x>0 and =0 for x<=0).
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