# Use common functions in formula expressions
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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`. |