Re: Angle Units For Trig Functions

On Thu, 24 Oct 2024 04:47:06 +0000, Lawrence D'Oliveiro wrote:

On Thu, 24 Oct 2024 02:17:15 -0000 (UTC), Steven G. Kargl wrote:
 

One of these values is wrong.

 
Only if you assume the input numbers were somehow “exact” or “perfect” to
begin with.
 
There’s an old principle in computing: “Garbage In, Garbage Out”.

People discussing Fortran normally use floating point math when
computing sin(x) or any other function of a "real" quantity.

 

You seem to be missing that argument reduction for sind(x)
is much easier than argument reduction for sin(x).

 
But that only worked for one angle, and for nothing else.

ROFL.

For sin(x), argument reduction will give sin(0) = 0, exactly.
That's one angle.

For sind(x), argument reduction will give sind(x) = 0, exactly,
for countable many angles.

--
steve