PHP: counting arcctg and ctg

is there any function in PHP which would g开发者_如何学Pythonet the cotangent and arccotangent of my number?

Thanks

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And arccotangent(a) would be atan(1/a).

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Take a look at the tan function in the PHP manual for the cotangent, notably the comment here for cotangents

<?php
//FOR PHP 4
function cot($rad)
{
    return tan(M_PI_2 - rad2deg($rad));
}

//FOR PHP 3
function cot($rad)
{
    return tan(M_PI/2 - rad2deg($rad));
}
?>

See here for #2

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http://php.net/manual/en/function.atan.php

theres a cotan funciton in teh comments for http://php.net/manual/en/function.tan.php

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I believe there are no built-ins for those. So you'll have to write/find some. Cot is in the comments for tan() on php.net

http://php.net/manual/en/function.tan.php

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tan will give you the tangent. Cotangent is 1/tan. You can easily use the arctan function to calculate the arccotan taking in mind that

arccot x = (PI / 2) - arctan x