# Use common functions in formula expressions
<a name="expression-common-functions"></a>

In [transforms](transforms.md) and [metrics](metrics.md), you can use the following functions to calculate common mathematical functions in transforms and metrics.


| Function | Description | 
| --- | --- | 
|  `abs(x)`  |  Returns the absolute value of `x`.  | 
|  `acos(x)`  |  Returns the arccosine of `x`.  | 
|  `asin(x)`  |  Returns the arcsine of `x`.  | 
|  `atan(x)`  |  Returns the arctangent of `x`.  | 
|  `cbrt(x)`  |  Returns the cubic root of `x`.  | 
|  `ceil(x)`  |  Returns the nearest integer greater than `x`.  | 
|  `cos(x)`  |  Returns the cosine of `x`.  | 
|  `cosh(x)`  |  Returns the hyperbolic cosine of `x`.  | 
|  `cot(x)`  |  Returns the cotangent of `x`.  | 
|  `exp(x)`  |  Returns `e` to the power of `x`.  | 
|  `expm1(x)`  |  Returns `exp(x) - 1`. Use this function to more accurately calculate `exp(x) - 1` for small values of `x`.  | 
|  `floor(x)`  |  Returns the nearest integer less than `x`.  | 
|  `log(x)`  |  Returns the `loge` (base `e`) of `x`.  | 
|  `log10(x)`  |  Returns the `log10` (base `10`) of `x`.  | 
|  `log1p(x)`  |  Returns `log(1 + x)`. Use this function to more accurately calculate `log(1 + x)` for small values of `x`.  | 
|  `log2(x)`  |  Returns the `log2` (base `2`) of `x`.  | 
|  `pow(x, y)`  |  Returns `x` to the power of `y`. This is equivalent to `x ^ y`.  | 
|  `signum(x)`  |  Returns the sign of `x` (`-1` for negative inputs, `0` for zero inputs, `+1` for positive inputs).  | 
|  `sin(x)`  |  Returns the sine of `x`.  | 
|  `sinh(x)`  |  Returns the hyperbolic sine of `x`.  | 
|  `sqrt(x)`  |  Returns the square root of `x`.  | 
|  `tan(x)`  |  Returns the tangent of `x`.  | 
|  `tanh(x)`  |  Returns the hyperbolic tangent of `x`.  |