[issue35880] math.sin has no backward error; this isn't documented

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

As Mark said, the behavior of Python's floating-point math functions (not just trig, but also log, pow, exp, ...) is inherited almost entirely from the platform C's math libraries.  Python itself guarantees nothing about what `math.sin(x)` returns for any `x` - and it can, & does, vary across platforms.

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nosy: +tim.peters

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<https://bugs.python.org/issue35880>
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