There is no single-key equivalent to the `calc-arcsin`

function.
Instead, you must first press `I` (`calc-inverse`

) to set
the **Inverse Flag**, then press `S` (`calc-sin`

).
The `I` key actually toggles the Inverse Flag. When this flag
is set, the word ``Inv'` appears in the mode line.

Likewise, the `H` key (`calc-hyperbolic`

) sets or clears the
Hyperbolic Flag, which transforms `calc-sin`

into `calc-sinh`

.
If both of these flags are set at once, the effect will be
`calc-arcsinh`

. (The Hyperbolic flag is also used by some
non-trigonometric commands; for example `H L` computes a base-10,
instead of base-*e*, logarithm.)

Command names like `calc-arcsin`

are provided for completeness, and
may be executed with `x` or `M-x`. Their effect is simply to
toggle the Inverse and/or Hyperbolic flags and then execute the
corresponding base command (`calc-sin`

in this case).

The Inverse and Hyperbolic flags apply only to the next Calculator
command, after which they are automatically cleared. (They are also
cleared if the next keystroke is not a Calc command.) Digits you
type after `I` or `H` (or `K`) are treated as prefix
arguments for the next command, not as numeric entries. The same
is true of `C-u`, but not of the minus sign (`K -` means to
subtract and keep arguments).

The third Calc prefix flag, `K` (keep-arguments), is discussed
elsewhere. See section Keep Arguments.

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