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asin(3) [php man page]

ASIN(3) 								 1								   ASIN(3)

asin - Arc sine

SYNOPSIS
float asin (float $arg) DESCRIPTION
Returns the arc sine of $arg in radians. asin(3) is the complementary function of sin(3), which means that a==sin(asin(a)) for every value of a that is within asin(3)'s range. PARAMETERS
o $arg - The argument to process RETURN VALUES
The arc sine of $arg in radians SEE ALSO
sin(3), asinh(3), acos(3), atan(3). PHP Documentation Group ASIN(3)

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