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* math: change the formula used for acos.snsz2012-05-051-10/+8
* acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))nsz2012-03-221-3/+1
* x86_64 math asm, long double functions onlyRich Felker2012-03-201-0/+20