Re: Incorrect values of sin and cos

From: anshu khare (anshukhare1998_at_[hidden])
Date: 2020-01-16 23:47:29

Cos(pi/2) gives an exact zero.
Cos(3*pi/2) gives a value less than €.
But cos(7*pi/2) gives a large negative value which is not less than €.

Anshu

On Thu, 16 Jan, 2020, 11:29 PM John Maddock via Boost, <
boost_at_[hidden]> wrote:

>
> On 16/01/2020 15:08, anshu khare via Boost wrote:
> > cos(3*pi(cpp_bin_float_50>()/2)) does not give correct value.
>
> What do you call "correct"?  If you're expecting an exact 0 result, then
> you're going to be disappointed - likewise with double which also does
> not yield an exact 0 in your test case (at least on msvc).
>
> John.
>
> > Only cos(pi(cpp_bin_float_50>()/2)) gives correct value.
> > All odd multiples of cos(pi/2) do not give correct value.
> >
> > The issue with sin() as well.
> >
> > Anshu
> >
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