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2013-05-18math: sin cos cleanupSzabolcs Nagy-6/+6
* use unsigned arithmetics * use unsigned to store arg reduction quotient (so n&3 is understood) * remove z=0.0 variables, use literal 0 * raise underflow and inexact exceptions properly when x is small * fix spurious underflow in tanl
2012-03-15efficient sincos based on sin and cosnsz-0/+68