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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 is math.POS_INFINITY or math.NEG_INFINITY, then fastly.error will be set to EDOM.
• If the x argument is subnormal or if the result overflows, then fastly.error will be set to ERANGE.

Example

declare local var.fo FLOAT;

set var.fo = math.tan(math.PI_4);