Math.sincos(x)?

[Boris Zbarsky]

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