sin, cos, tan and rounding error

Question

I\'m doing some trigonometry calculations in C/C++ and am running into problems with rounding errors. For example, on my Linux system:

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Answer 1

I rather think that will be system-dependent. I don't think the Standard has anything to say on how accurate the transcendental functions will be. Unfortunately, I don't remember seeing any discussion of function precision, so you'll probably have to figure it out yourself.