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fpsinpix xprocedure
fpcospix xprocedure
fptanpix xprocedure
x
flonum

Like (fpsin (* pi x)), (fpcos (* pi x)) and (fptan (* pi x)), respectively, but accurate near roots and singularities. When x = (+ n 0.5) for some integer n, (fptanpix x) = +nan.0.