It returns cosine value .

Example

<?php
echo cos(90);
?>

Output

-0.44807361612917

It round the fractions up

Example

<?php
echo ceil(5.2);
?>

Output

6

It converts binary number to decimal number

Example

<?php
echo bindec(“0011”);
?>

Output

3

It  convert a number between arbitrary bases

Example

<?php
$octal = “0017”;
$dec = base_convert($octal,8,10);
echo “$octal in octal is $dec in decimal.”;
?>

Output

0017 in octal is 15 in decimal.

It returns  Inverse hyperbolic tangent

<?php
echo atanh(.17);
?>

Output

0.17166666350058

It  returns Arc tangent

Example

<?php
echo atan(.50);
?>

Output

0.46364760900081

It  returns arc tangent of two variables

<?php
echo atan2(17,17);
?>

Output

0.78539816339745

It returns  Inverse hyperbolic sine

Example

<?php
echo asinh(.90);
?>

Output

0.80886693565278

It returns  arc sine

Example

<?php
echo asin(.90);
?>

Output

1.1197695149986

It returns  Inverse hyperbolic cosine

Example

<?php
echo acosh(90);
?>

Output

5.1929259852637