Need help on this OCaml code asap!!

sinx=x (if x is "sufficiently small"), and the trigonometric identity: sinx=3sin(x/3)4sin3(x/3) to reduce the size of the argument of sin if x is not sufficiently small. For purposes of this exercise an angle is considered "sufficiently small" if its magnitude is less than 0.1 radians. These ideas are incorporated in the following functions (using floating-point arithmetic throughout): let cube x=x,x,x let px=3.0,x=,4.0, cube x let rec sine angle = if abs_float angle