PHP math acos() function

The acos() function is useful predefined PHP function to calculate trigonometry problem. It is used to find the arc cosine of a number in radians.

Note: acos(-1) returns the value of Pi.

Syntax:

Parameter	Description	Required/Optional
Number	Specify a number in range -1 to 1.	Required

Example1

<?php
$num=0;
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
?>

Output:

Your number is :0
By using 'acos()' function your number is :1.5707963267949

Example2

<?php
$num=1;
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
?>

Output:

Your number is :1
By using 'acos()' function your number is :0

Example3

<?php
$num=2;
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
echo "<br>"." Note : Your number is outside the range [-1,1]";
?>

Output:

Your number is :2
By using 'acos()' function your number is :NAN
Note : Your number is outside the range [-1,1]

Example4

<?php
$num=(0.64);
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
?>

Output:

Your number is :0.64
By using 'acos()' function your number is :0.87629806116834

Example5

<?php
$num=(-0.4);
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
?>

Output:

Your number is :-0.4
By using 'acos()' function your number is :1.9823131728624

Example6

<?php
$num=(-1);
echo "Your number is :".$num;
echo "<br>"."By using 'acos()' function your number is :".(acos($num));
?>

Output:

Your number is :-1
By using 'acos()' function your number is :3.1415926535898

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PHP math acos() function

Note: acos(-1) returns the value of Pi.

Syntax:

Example1

Example2

Example3

Example4

Example5

Example6

Feedback

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