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My favorite implementation of a super fast but not that accurate cosinus is from a now defunct forum. Good thing we have webarchive ! https://web.archive.org/web/20111104163237/http://www.devmas...

You can also use the Chebyshev polynomials to economise a higher degree taylor series with bit of a loss of accuracy.

you can't because boycott Chebyshev

You can't boycott Chebyshev, he died 1894 or so.