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I recently uncovered an hp9830a which still works. I've been playing around with it and noticed that it has the following trig functions:

sin(x)
cos(x)
tan(x)
atn(x)

It doesn't have built in functions for arcsin or arccos. I was wondering why. Does anyone know?

Thanks,

Andy

I'm not sure if they were trying to save space in the interpreter or, because BASIC was originally designed as a teaching language, trying to force the programmers to think about how to generate ASIN and ACOS from the other functions. Maybe both.

RTFM! (it is available on this very site!)
Page 2-18: "The arcsine and arccosine functions are not directly obtainable on the Model 30. However, they can be easily obtained by using the following formulas..."

/ji, who hasn't used a 9830 in 20 years