math.tan
Available inall subroutines.
Computes the tangent of its argument x
, measured in radians.
Parameters
x
- Floating point value representing an angle in radians.
Return Value
Upon successful completion, this function returns the tangent of x
.
If x
is math.NAN
, a NaN will be returned.
If x
is ±0, x
will be returned.
If x
is math.POS_INFINITY
or
math.NEG_INFINITY
, a domain error
occurs and a NaN will be returned.
If x
is subnormal, a range error occurs and x
will be returned.
If the result would cause an overflow, a range error occurs and math.tan
will return math.POS_HUGE_VAL
or
math.NEG_HUGE_VAL
, with the same
sign as the result of the function.
Errors
- If the
x
argument ismath.POS_INFINITY
ormath.NEG_INFINITY
, thenfastly.error
will be set toEDOM
. - If the
x
argument is subnormal or if the result overflows, thenfastly.error
will be set toERANGE
.
Example
declare local var.fo FLOAT;
set var.fo = math.tan(math.PI_4);