TRIGONIOMETRIC FUNCTIONS:

            Apparently the IIT 2c87 recognises and executes some
            i80387 trigoniometric functions. UNDOCUMENTED
            FSIN (sine) and FCOS (cosine) have been tested and function
            according to the Intel 80387 specifications. FSINCOS
            (available on the Intel 80287XL, 80387 and up) does not
            work.

FSIN:       OPCODE: d9,fe     IIT 2c87+ (also Intel 80387+) UNDOCUMENTED
            Calculates the sine of the input in radians in ST(0). After
            calculation, ST(0) contains the sine. Takes approximately
            120 clocks.

FCOS:       OPCODE: d9,ff     IIT 2c87+ (also Intel 80387+) UNDOCUMENTED
            Calculates the cosine of the input in radians in ST(0).
            After calculation, ST(0) contains the cosine. Takes
            approximately 120 clocks.




.