acos():
<?Php
echo acos(0); // Output is 1.5707963267949
echo "<br>";
echo acos(1); // Output 0
echo "<br>";
echo acos(-1); // Output is 3.1415926535898
echo "<br>";
echo acos(-5); // Output is NAN
?>acos(X);It takes input range from +1 to -1 , for any other input it returns NAN ( not a number ). How to check the output by using is_nan() ?
deg2rad() with acos()
We can use deg2rad() to convert Degree value to radian and then use acos().<?Php
echo acos(deg2rad(0)); // 1.5707963267949
echo "<br>";
echo acos(deg2rad(90)); // NAN
echo "<br>";
echo acos(deg2rad(180)); // NAN
?>Questions
- What does the `acos()` function in PHP do?
- What is the purpose of the `acos()` function in PHP?
- How is the `acos()` function used to calculate the inverse cosine of a number?
- What is the range of values returned by the `acos()` function in PHP?
- Can the `acos()` function be used with both degrees and radians?
- What happens if you pass an invalid argument to the `acos()` function?
- How can you use the `acos()` function to calculate the angle in radians given the cosine value?
- Are there any alternative ways to calculate the inverse cosine in PHP besides using the `acos()` function?
- Can the `acos()` function return a complex number?
- What type of value does the `acos()` function return: integer, float, or something else?
MIN() function
Math Functions
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