Label: FCOS Function: Floating point cosine function
Reference address：Floating point cosine function
Entry condition: Operand is in [R0].
Exit information: Result is still in [R0].
Affected resources: DPTR, PSW, A, B, R2~R7, bits 1DH~1FH Stack requirement: 6 bytes
FCOS: LCALL FABS ;COS(-X) = COS X
MOV R5,#1 ;Constant 1.5708 (π/２)
MOV R6,#0C9H
MOV R7,#10H
CLR 1EH
LCALL MVR0
CLR F0
LCALL AS1 ;ｘ＋（π/２）
LCALL MOV0 ;Save the result, then run the following FSIN program
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