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(nasm.info)Section B.4.100

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B.4.100. `FSIN', `FSINCOS': Sine and Cosine
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     FSIN                          ; D9 FE                [386,FPU]
     FSINCOS                       ; D9 FB                [386,FPU]

   `FSIN' calculates the sine of `ST0' (in radians) and stores the
result in `ST0'. `FSINCOS' does the same, but then pushes the cosine of
the same value on the register stack, so that the sine ends up in `ST1'
and the cosine in `ST0'. `FSINCOS' is faster than executing `FSIN' and
`FCOS' (see *Note Section B.4.74::) in succession.

   The absolute value of `ST0' must be less than 2**63.