Complete PHP Math Reference
The asin() function returns the arcsine of a number as a numeric value between
-PI/2 and PI/2 radians.
| Parameter | Description |
|---|---|
| x | Required. Must be a numeric value in the range -1 to 1 |
Note: If the parameter x is outside the range -1 to 1, the browser will return -1.#IND.
Note: 1 will return the value of PI/2.
In this example we will get the arcsine of different numbers:
The output of the code above will be:
Complete PHP Math Reference
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