Description
The
tan function returns the tangent of x (measured in radians).
Returns
The
tan function returns the tangent value.
Implementation Notes
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Over the range -pi/4 to +pi/4, the absolute error is
less than 2 * DBL_EPSILON. The absolute error
increases considerably as the argument approaches
pi/2, or -pi/2.
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Where the argument is close to any other odd multiple
of pi/2, then floating point overflow may be detected
and HUGE_VAL or -HUGE_VAL will be returned. If the
corresponding interrupt is unmasked then the signal
SIGFPE will be raised.
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