If `bc`

is invoked with the `-l`

option, a math library is
preloaded and the default `scale` is set to 20. The math functions will
calculate their results to the scale set at the time of their call. The
math library defines the following functions:

`s (`

`x`)-
The sine of
`x`,`x`is in radians. `c (`

`x`)-
The cosine of
`x`,`x`is in radians. `a (`

`x`)-
The arctangent of
`x`, arctangent returns radians. `l (`

`x`)-
The natural logarithm of
`x`. `e`(`x`)-
The exponential function of raising
`e`to the value`x`. `j`(`n,x`)-
The bessel function of integer order
`n`of`x`.

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