At 13:35 02/03/2007 +0100, Lilian van Emden wrote:
... there is a very irritating error
if you use the sinus/ cosinus [...] function they give different
value as answer (compare with my calculator, the calculator on two
different computers), so I guess, somethings wrong with open office
cos (9.17/12)=0.70(others) or 0.72(open office) ->80.30 degrees
(others) or 82.72 degrees (open office)
You are confusing two different functions: what in English is called
the cosine function and its inverse, the arccosine function. (Sorry
I don't know any Dutch, but I assume that "cosinus" refers to the cosine.)
If you are hoping to produce an angle from this calculation, what you
need must be the arccosine function, and you have evidently used this
correctly on your calculator and other computers to produce the
answer 0.70. The arccosine function in OpenOffice Calc is ACOS,
whereas you have used the cosine function COS to produce the answer
0.72 - which is correct for cosine but not for arccosine.
As someone has already pointed out, you also have the conversion from
radians to degrees incorrect, and your answers in degrees is twice
what it should be. The arccosine of 9.17/12 is 40.17 degrees and
=ACOS(9.17/12)*180/PI() in OpenOffice Calc correctly gives this.
Brian Barker
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