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### D.16.2 `rmath` miscellaneous functions

Some less frequently used real valued mathematical functions are also accessible by the `rmath` library interface. The functions with names in this group take a single real operand.

    gammafn         lgammafn        digamma
    trigamma        tetragamma      pentagamma

The ones in this group take a pair of real operands `(x,y)`.

    beta            lbeta           bessel_j       bessel_y

Those remaining take a triple of real operands `(x,(y,z))`.

    bessel_i        bessel_k

An alternative and better documented selection of Bessel functions is provided by the `bes` library interface (`bes`).

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