Available Math functions
(www.excelfunctions.net)

Basics
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Trigonometrie and other functions
ABS		// Returns the absolute value
ACOS		// Returns the Arccosine of a number    
ASIN		// Returns the Arcsine of a number
ASINH		// Returns the Inverse Hyperbolic Sine of a number
ATAN		// Returns the Arctangent of a given number
ATAN2		// Returns the Arctangent of a given pair of x and y coordinates
CEILING		// Rounds a number away from zero
COS		// Returns the Cosine of a given angle
COSH		// Returns the hyperbolic cosine of a number
EXP		// Returns e raised to a given power 
FLOOR		// Rounds a number towards zero
INT		// Rounds a number down to the next integer
LN		// Returns the natural logarithm of a given number
LOG		// Returns the logarithm of a given number, to a specified base
LOG10		// Returns the base 10 logarithm of a given number
PI		// Returns the constant value of pi
POWER		// Returns the result of a given number raised to a supplied power
RAND		// Returns a random number between 0 and 1
RANDBETWEEN	// Returns a random number between two given integers
SIGN		// Returns the sign (+1, -1 or 0) of a supplied number 
SIN		// Returns the Sine of a given angle
SINH		// Returns the Hyperbolic Sine of a number
SQRT		// Returns the positive square root of a given number
SUM		// Returns the sum of a supplied list of numbers
TAN		// Returns the Tangent of a given angle
TANH		// Returns the Hyperbolic Tangent of a given number
TRUNC		// Truncates a number towards zero

Statistical (analog Excel)
AVERAGE		// Returns the average of the numbers provided
AVERAGEA	// Same as AVERAGE but treats booleans as 0 or 1
COUNT		// Counts the number of numerical values
COUNTA		// Counts the number of non empty values
COUNTBLANK	// Counts the number of empty values
COUNTIF		// Returns the number of values that satisfy a given criteria
MAX		// Returns the largest value from a list of supplied numbers
MAXA		// Same as MAX but treats booleans as 0 or 1
MIN		// Returns the smallest value from a list of supplied numbers 
MINA		// Same as MIN but treats booleans as 0 or 1
STDEV		// Returns the standard deviation of a supplied set of values
STDEVA		// Same as STDEV but treats booleans as 0 or 1
STDEVP
STDEVPA
VAR		// Returns the variance of a supplied set of values
VARA		// Same as VAR but treats booleans as 0 or 1
VARP
VARPA

Text functions
CHAR		// Returns the character specified by the code number
CODE		// Returns a numeric code for the first character in a text string
CONCATENATE	// Joins several text items into one text item
FIND		// Finds one text value within another (case-sensitive)
LEFT		// Returns the leftmost characters from a text value
LEN		// Returns the number of characters in a text string
LOWER		// Converts text to lowercase
MID		// Returns a specific number of characters from a text string starting at the position you specify
PROPER		// Capitalizes the first letter in each word of a text value
REPLACE		// Replaces characters within text
REPT		// Repeats text a given number of times
RIGHT		// Returns the rightmost characters from a text value
SEARCH		// Finds one text value within another (not case-sensitive)
SUBSTITUTE	// Substitutes new text for old text in a text string
T		// Converts its arguments to text
TEXT		// Formats a number and converts it to text
TRIM		// Removes spaces from text
UPPER		// Converts text to uppercase
VALUE		// Converts a text argument to a number