The ** sin()** function in PHP returns the sine of a number in radians.

The illustration below shows the mathematical representation of the `sin()`

function.

This

`sin()`

function only works for right-angle triangles.

```
float sin(num)
```

The `sin()`

function requires a number that represents an angle in radians as a parameter.

To convert degrees to radians, use the following formula:

```
radians = degrees * ( M_PI / 180 )
```

`sin()`

returns the sine of the number that is sent as a parameter. The return value is in the range `[-1,1]`

.

<?php#Positive number in radiansecho("sin(2.3): ");echo (sin(2.3));?><?php#Negative number in radiansecho("sin(-2.3): ");echo (sin(-2.3));?><?php#converting the degrees angle into radians and then applying sin()#degrees = 90echo("sin(90 * (M_PI / (180))): ");echo (sin(90 * (M_PI / (180))));?>

Attributions:

- undefined by undefined

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