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; see Symbolic Mode.

The `Q` (`calc-sqrt`

) [`sqrt`

] function is described elsewhere;
see Basic Arithmetic. With the Inverse flag [`sqr`

], this command
computes the square of the argument.

See Numeric 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.