Formulas can contain cell references, constants, single parameter 
functions, multi parameters functions, cell name references
and cell range functions. 

Cell references :
If CellNameMode is nmRC then cell references are in RxCx format,
where x is the row number and y is the column number.
If CellNameMode is nmA1 then a cell reference consists of 2 parts : 
the column identifier and the row identifier. The column identifier is a 
character, starting from A for the first column, B for the second column, etc.. 
After column 26, the column identifier is a double character string AA, AB, 
etc... The row identifier starts at 1 for the first editable row.
Thus, cell 1,1 is A1, cell 2,2 is B2, cell 27,27 is AA27
Cell ranges are specified by the top left cell and bottom right cell. Thus, 
the first 15 cells in column 1, can be specified as A1:A15. 

Constants : 
Following constants are available : PI, E,True,False

Single parameter functions :
ABS(parameter) : absolute value
ROUND(parameter) : rounds value
TRUNC(parameter) : truncates value
CEILING(parameter; significance) : rounds the parameter to the nearest 
multiple of significance
FRAC(parameter) : returns fractional part of value
FACT(parameter) : factioral of value
INT(parameter) : int part of value
SIN(parameter) : sine of value
COS(parameter) : cosine of value
TAN(parameter) : tangens of value
COTAN(parameter) : cotangens of value
SINH(parameter) : hyperbolic sine of value
COSH(parameter) : hyperbolic cosine of value
TANH(parameter) : hyperbolic tangens of value
COTANH(parameter) : hyperbolic cotangens of value
ASIN(parameter) : arcsin of value
ACOS(parameter) : arccos of value
ATAN(parameter) : arctangens of value
ACOTAN(parameter) : arccotangens of value
LN(parameter) : natural logarithm of value
LOG2(parameter) : base 2 logarithm of value
LOG10(parameter) : base 10 logarithm of value
EXP(parameter) : exponential of value
RAND(parameter) : random between 0 and value
RADIANS(parameter) : converts degrees to radians
DEGREES(parameter) : converts radians to degrees
SQR(parameter) : square of value
SQRT(parameter) : square root of value
CUBE(parameter) : cubic square of value
CHS(parameter) : change sign
POWER(parameter,exp) : parameter to exponent exp

Multi parameter functions :
LT(param1;param2) : larger than : returns 1 of param1>param2
ST(param1;param2) : smaller than : returns 1 of param1<param2
EQ(param1;param2) : equal : returns 1 of param1=param2 else 0
CHOOSE(sel;param1;param2) : returns param1 if sel>0 else param2

Cell range functions : 
SUM(range) : sum of all cell values in range
PRODUCT(rangfe) : product of all cell values in range
AVERAGE(range) : average of all cell values in range
MIN(range) : min. cell value in range
MAX(range) : max. cell value in range
COUNT(range) : nr. of cells in range
COUNTA(range) : nr of non blank cells in range
COUNTIF(range;condition) : nr of cells meeting condition in range
STDEV(range) : standard deviation of range
STDEVP(range) : standard deviation of total population of range
DEVSQ(range) : sum of squares of deviations of range
VAR(range) : variance of range

Date & Time functions : 
HOUR(parameter) : gets the hour from a cell containing a valid time string
MIN(parameter) : gets the minute from a cell containing a valid time string
SECOND(parameter) : gets the second from a cell containing a valid time 
string
DAY(parameter) : gets the day from a cell containing a valid time string
MONTH(parameter) : gets the month from a cell containing a valid time string
YEAR(parameter) : gets the year from a cell containing a valid time string
WEEKDAY(parameter) : gets the day of the week from a cell containing a 
valid time string
TODAY : gets the current day
NOW : gets the current time

Logical functions :
AND(parameters) : logical AND function
OR((parameters) : logical OR function
NAND(parameters) : logical NAND function
NOR((parameters) : logical NOR function
XOR((parameters) : logical XOR function
NOT(parameter) : logical NOT function
TRUE : constant returning true
FALSE: constant returning false

String functions :
LEN(parameter) : returns the length of a string value
LOWER(parameter) : returns string in lowercase
UPPER(parameter) : returns string in uppercase
CONCATENATE(parameter list) : returns concatenated string of parameters
SUBSTITUTE(param text; param oldtext; param new text) : returns string with 
oldtext replaced by newtext
LEFT(param string;len integer) : returns first len charactares of string
RIGHT(param string;len integer) : returns last len characters of string
MID(param string; pos; len: integer): returns len characters starting from 
position pos in string
TRIM(param) : removes all spaces from text except spaces between words
SEARCH(find text; text) : returns position of string find text in text
LOOKUP(param; range1, range2) : returns the value of the element in range2 
that has the index of the matching element in range1 for param
MATCH(lookup; range) : returns the index of the element  param in the range
INDEX(range; val1, val2) : returns the value of element at index val1,val2 in 
the range

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