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acos.s fix: use the formula acos(x) = atan2(sqrt(1-x),sqrt(1+x))
[musl] / src / math / i386 / atan.s
1 .global atan
2 .type atan,@function
3 atan:
4         fldl 4(%esp)
5         fld1
6         fpatan
7         ret
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