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(nasm.info)Section B.4.74

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B.4.74. `FCOS': Cosine
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     FCOS                          ; D9 FF                [386,FPU]

   `FCOS' computes the cosine of `ST0' (in radians), and stores the
result in `ST0'. The absolute value of `ST0' must be less than 2**63.

   See also `FSINCOS' (*Note Section B.4.100::).