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cos — Cosine

Description

function cos(float $num): float

cos() returns the cosine of the num parameter. The num parameter is in radians.

Parameters

num: An angle in radians

Return Values

The cosine of num

Examples

Example #1 cos() example

<?php
echo cos(M_PI); // -1
?>

See Also

acos() - Arc cosine
sin() - Sine
tan() - Tangent
deg2rad() - Converts the number in degrees to the radian equivalent

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