PHP cos( ) Function Last Updated : 22 Jun, 2023 Comments Improve Suggest changes Like Article Like Report Trigonometry is an important part of mathematics and PHP’s math functions provides us with some functions which are very useful for calculations involving trigonometry. The cos()function in PHP is used to find the cosine of a number. The cos() function returns a float value between -1 and 1, which represents the cosine of the angle. The argument passed to it must be in radians. Syntax: float cos($value) Parameters: This function accepts a single parameter value. It is the number whose cosine you want to find. The value must be in radians. Return Value: It returns a floating point number which is the cosine value of number passed to it as argument. Examples: Input : cos(3) Output : -0.98999249660045 Input : cos(-3) Output : -0.98999249660045 Input : cos(2*M_PI) Output : 1 Input : cos(0) Output : 1 Below programs illustrate cos() function in PHP: Passing 3 as a parameter: html <?php echo (cos(3)); ?> Output: -0.98999249660045 Passing -3 as a parameter: html <?php echo (cos(-3)); ?> Output: -0.98999249660045 When (2*M_PI) is passed as a parameter, M_PI is a constant in PHP whose value is 3.1415926535898: html <?php echo (cos(2*M_PI)); ?> Output: 1 Passing 0 as a parameter: html <?php echo (cos(0)); ?> Output: 1 Reference: http://php.net/manual/en/function.cos.php Comment More infoAdvertise with us Next Article PHP cos( ) Function S Shubrodeep Banerjee Follow Improve Article Tags : Misc Web Technologies PHP PHP-math PHP-function +1 More Practice Tags : Misc Similar Reads PHP acos( ) Function Trigonometry is an important part of mathematics and PHPâs math functions provides us with some functions which are very useful for calculations involving trigonometry. One of such function is acos() function. The acos() function in PHP is used to find the arc cosine of a number in radians. We alrea 2 min read PHP | bcsqrt() Function The bcsqrt() function in PHP is an inbuilt function and is used to evaluate the square root of an arbitrary precision number. This function accepts an arbitrary precision number as a string and returns the square root of the number after scaling the result to a specified precision. Syntax: string bc 2 min read PHP asin( ) Function Trigonometry is an important part of mathematics and PHPâs math functions provides us with some functions which are very useful for calculations involving trigonometry. One of such function is asin() function. The asin() function in PHP is used to find the arc sine of a number in radians. We already 2 min read PHP each() Function The each() function is an inbuilt function in PHP and is used to get the current element key-value pair of the given array to which the internal pointer is currently pointing. After returning the key and value of the current element the internal pointer is incremented by one in the array. Note: You 2 min read PHP | Functions A function in PHP is a self-contained block of code that performs a specific task. It can accept inputs (parameters), execute a set of statements, and optionally return a value. PHP functions allow code reusability by encapsulating a block of code to perform specific tasks.Functions can accept param 8 min read PHP compact() Function The compact() function is an inbuilt function in PHP and it is used to create an array using variables. This function is the opposite of the extract() function. It creates an associative array whose keys are variable names and their corresponding values are array values. Syntax: array compact("varia 2 min read PHP fputs( ) Function The fputs() function in PHP is an inbuilt function which is used to write to an open file. The fputs() function stops at the end of the file or when it reaches the specified length passed as a parameter, whichever comes first. The file, string, and the length that has to be written are sent as param 3 min read PHP | fgets( ) Function The fgets() function in PHP is an inbuilt function which is used to return a line from an open file. It is used to return a line from a file pointer and it stops returning at a specified length, on end of file(EOF) or on a new line, whichever comes first. The file to be read and the number of bytes 2 min read PHP | fstat( ) Function The fstat() function in PHP is an inbuilt function which is used to return information about an open file. The file name is sent as a parameter to the fstat() function and it returns an array with the following elements : Numeric Associative Description 0 dev Device number 1 ino inode number* 2 mode 3 min read PHP end() Function The end() function is an inbuilt function in PHP and is used to find the last element of the given array. The end() function changes the internal pointer of an array to point to the last element and returns the value of the last element.Syntax:end($array)Parameters:This function accepts a single par 2 min read Like