Math.sincos(x)?

[kdex]

Also the sign of the `cos` component is wrong for a bunch of inputs.

On Thursday, June 22, 2017 8:16:21 PM CEST Boris Zbarsky wrote:
> On 6/22/17 2:13 PM, Алексей wrote:
> > function sincos (a) {
> > 
> >     const sin = Math.sin(a)
> >     const cos = (1 - sin**2)**0.5
> 
> This will completely fail for a near pi/2.  It will return zero instead
> of the correct small but nonzero value it should be returning.
> 
> -Boris
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