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  1. www.php.net › manual › enPHP: atan - Manual

    However, x == atan(tan(x)) only holds for those x which are in the range of atan, which are those x with -pi/2 < x < pi/2. Of course, those equalities are limited by precision.

    • Round

      Returns the rounded value of num to specified precision...

    • Max

      If the first and only parameter is an array, max () returns...

    • ABS

      Absolute value Return Values ¶ The absolute value of num. If...

    • POW

      Return Values ¶ num raised to the power of exponent. If both...

    • Floor

      When the 79.99 was multiplied by 100, the actual value...

    • Min

      If the first and only parameter is an array, min () returns...

    • Ceil

      Return Values ¶ num rounded up to the next highest integer....

    • Hexdec

      Returns the decimal equivalent of the hexadecimal number...

  2. www.w3schools.com › php › func_math_atanPHP atan () Function - W3Schools

    Definition and Usage The atan () function returns the arc tangent of arg as a numeric value between -Pi/2 and Pi/2 radians.

  3. www.geeksforgeeks.org › php › php-atan-functionPHP atan ( ) Function - GeeksforGeeks

    Jun 22, 2023 · The atan () function in PHP is used to find the arc tangent of an argument passed to it which has as a numeric value between -Pi/2 and Pi/2 radians. We already have discussed about PHP | tan () Function.

  4. www.codecademy.com › docs › phpPHP | Math Functions | atan() | Codecademy

    Jul 24, 2023 · PHP atan () Published Jul 24, 2023 The built-in math function atan() determines the arc tangent of a given value. It is also known as the inverse tangent function, it identifies the angle whose tangent is equal to the specified value. The inverse function of atan() is the tan() function.

  5. www.tutorialspoint.com › php-atan-functionPHP atan Function - Online Tutorials Library

    Jun 29, 2020 · Learn how to use the PHP atan function to calculate the arc tangent of a number. Understand its syntax, parameters, and see examples for better comprehension.

  6. www.w3resource.com › php › function-referencePHP : atan() function - w3resource

    Aug 19, 2022 · The atan() function returns the arctangent of a number as a numeric value in radians.

  7. www.happycoders.in › php-atan-functionPHP atan () Function - Happy Coders

    Aug 4, 2025 · The PHP atan() function returns the arc tangent (inverse tangent) of a number in radians. Useful in trigonometric calculations.