added functions section

README.md

@@ -17,6 +17,51 @@
 
 ----
 
+#### Constants & Functions
+
+| Constants | Description  |
+|-----------|--------------|
+| `p()`     | PI           |
+| `e()`     | Euler number |
+
+| Function      | Description          |
+|---------------|----------------------|
+| `exp(x)`      | exponential          |
+| `sqrt(x)`     | square root          |
+| `pow(x,y)`    | x power y (`x**y`)   |
+| `fmod(x,y)`   | remainder of `x/y`   |
+| `hypot(x,y)`  | hypotenuse           |
+| `abs(x)`      | absolute \|x\|       |
+| `round(x)`    | convert to integer   |
+| `ceil(x)`     | next smallest int    |
+| `floor(x)`    | previous largest int |
+| `max(x,y,..)` | greatest number      |
+| `min(x,y,..)` | smallest number      |
+| `log(x)`      | natural logarithm    |
+| `log10(x)`    | base 10 logarithm    |
+| `randr`       | random number (0,1)  |
+| `srandr(x)`   | random with seed     |
+
+| Trigonometric | Functions          | Type    |
+|---------------|--------------------|---------|
+| `sind(x)`     | sine               | degrees |
+| `cosd(x)`     | cosine             | degrees |
+| `tand(x)`     | tangent            | degrees |
+| `asind(x)`    | arc sine           | degrees |
+| `acosd(x)`    | arc cosine         | degrees |
+| `atand(x)`    | arc tangent        | degrees |
+| `sin(x)`      | sine               | radians |
+| `cos(x)`      | cosine             | radians |
+| `tan(x)`      | tangent            | radians |
+| `asin(x)`     | arc sine           | radians |
+| `acos(x)`     | arc cosine         | radians |
+| `atan(x)`     | arc tangent        | radians |
+| `sinh(x)`     | hyperbolic sine    | radians |
+| `cosh(x)`     | hyperbolic cosine  | radians |
+| `tanh(x)      | hyperbolic tangent | radians |
+
+----
+
 ### Screenshot
 
 ![Screenshot](screenshot.png "Screenshot")