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"ARC" key on calculator lpage 12-27-2005
Posted by lpage on December 27, 2005, 9:28 am
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 Older scientific calculators had an "ARC" key used when solving
triangles. What key or combination of keys replaces the "ARC" key on
new calculators?


Posted by Wayne Brown on December 28, 2005, 6:04 pm
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 lpage@coolcityusa.com wrote:
> Older scientific calculators had an "ARC" key used when solving
> triangles. What key or combination of keys replaces the "ARC" key on
> new calculators?

What did the ARC key do? Was it used in combination with the SIN,
TAN, etc. keys to get the arcsine, arctan, etc. functions? If so, most
modern scientific calculators represent these with either ASIN, ATAN,
etc. or sin^-1, tan^-1, etc.

--
Wayne Brown (HPCC #1104) | "When your tail's in a crack, you improvise
fwbrown@bellsouth.net | if you're good enough. Otherwise you give
| your pelt to the trapper."
e^(i*pi) + 1 = 0 -- Euler | -- John Myers Myers, "Silverlock"

Posted by Paul Rubin on December 29, 2005, 7:37 pm
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> > Older scientific calculators had an "ARC" key used when solving
> > triangles. What key or combination of keys replaces the "ARC" key on
> > new calculators?

It's usually labelled something like INV (for inverse).

> What did the ARC key do? Was it used in combination with the SIN,
> TAN, etc. keys to get the arcsine, arctan, etc. functions?

Yes.

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