calc: Scientific Functions
9 Scientific Functions
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The functions described here perform trigonometric and other
transcendental calculations. They generally produce floating-point
answers correct to the full current precision. The ‘H’ (Hyperbolic) and
‘I’ (Inverse) flag keys must be used to get some of these functions from
the keyboard.
One miscellaneous command is shift-‘P’ (‘calc-pi’), which pushes the
value of ‘pi’ (at the current precision) onto the stack. With the
Hyperbolic flag, it pushes the value ‘e’, the base of natural
logarithms. With the Inverse flag, it pushes Euler’s constant ‘gamma’
(about 0.5772). With both Inverse and Hyperbolic, it pushes the “golden
ratio” ‘phi’ (about 1.618). (At present, Euler’s constant is not
available to unlimited precision; Calc knows only the first 100 digits.)
In Symbolic mode, these commands push the actual variables ‘pi’, ‘e’,
‘gamma’, and ‘phi’, respectively, instead of their values; 
Symbolic Mode.
The ‘Q’ (‘calc-sqrt’) [‘sqrt’] function is described elsewhere;
Basic Arithmetic. With the Inverse flag [‘sqr’], this command
computes the square of the argument.
Prefix Arguments, for a discussion of the effect of numeric
prefix arguments on commands in this chapter which do not otherwise
interpret a prefix argument.
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