asin(): the arc sine (inverse sine) of a given number in radians
<?Php
echo asin(0); // Output is 0
echo "<br>";
echo asin(1); // Output 1.5707963267949
echo "<br>";
echo asin(-1); // Output is -1.5707963267949
echo "<br>";
echo asin(4); // Output is NAN
?>asin(X);It takes input range from +1 to -1 , for any other input it returns NAN ( not a number )
deg2rad() with asin()
We can use deg2rad() to convert Degree value to radian and then use asin().<?Php
echo asin(deg2rad(0)); // 0
echo "<br>";
echo asin(deg2rad(1)); // 0.017454178737585
echo "<br>";
echo asin(deg2rad(-1)); // -0.017454178737585
?>Example 2: Calculating arcsin for a negative value
The *asin()* function can also be used to find the inverse sine of a negative value:
$value = -0.5;
$result = asin($value);
echo "The arcsin of $value is: " . $result;
// Outputs: The arcsin of -0.5 is: -0.5235987755983
Example 3: Converting radians to degrees after using asin()
To convert the result from radians to degrees:
$value = 0.5;
$radians = asin($value);
$degrees = rad2deg($radians);
echo "The arcsin of $value in degrees is: " . $degrees;
// Outputs: The arcsin of 0.5 in degrees is: 30
Plotting of SIN & SIN curves by using PHP GD function with deg2rad()
Questions
- What does the `asin()` function in PHP do?
- What is the purpose of the `asin()` function in PHP?
- How is the `asin()` function used to calculate the inverse sine of a number?
- What is the range of values returned by the `asin()` function in PHP?
- Can the `asin()` function be used with both degrees and radians?
- What happens if you pass an invalid argument to the `asin()` function?
- How can you use the `asin()` function to calculate the angle in radians given the sine value?
- Are there any alternative ways to calculate the inverse sine in PHP besides using the `asin()` function?
- Can the `asin()` function return a complex number?
- What type of value does the `asin()` function return: integer, float, or something else?
Math Functions
Subhendu Mohapatra
Author & Instructor at plus2net
I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.
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