SEC: Trigonometric tables for >90 degrees

[Rena Deutsch <renadeutsch@WORLDNET.ATT.NET>]

 I have a student who is looking for a trigonometric table which lists the
functions (sine, cosine, tangent?) for angles above 90 degrees. We found
tables for up to 90 degrees, but not above.
Does anyone know where we can find this? Or, is there a formula to figure it
out? That is, can you do something to the sine of 45 and sine of 75, for
example, to get the sine of 120 ?

 Please excuse if this sounds like gobbledy-gook, nonsense. I have no idea
if any of this makes any sense: since high school, I have had no idea of
what any of this trig stuff means....)

Rena Deutsch, Librarian
High School for the Humanities
New York, NY
renadeutsch@worldnet.att.net

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