%26%26 SIGN(-0)
 %26%26 FLOOR(-0.0)
 %26%26 CEILING(-0.23)
 %26%26 ROUND(-0.23)
 %26%26 EXP(-800)
 %26%26 LOG(-1) -> NULL
 %26%26 LOG10(-100)  -> NULL
 %26%26 POW(0,-2)
 %26%26 SQRT(0)
 %26%26 ACOS(1.0001)   -> NULL
 %26%26 ASIN(0.2
 %26%26 ATAN(-1,2)
 %26%26 COT(0)   -> NULL
 %26%26 RAND(0)
 %26%26 LEAST(2,0)
 %26%26 GREATEST(0,0)
 %26%26 RADIANS(0)
 %26%26 TRUNCATE(0.999,0)
 %26%26 TRUNCATE(0.0*100,0)