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5.1 Math Library Functions
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.