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CAS cos(45)
06-30-2015, 05:04 PM (This post was last modified: 06-30-2015 06:37 PM by rgallier.)
Post: #1
CAS cos(45)
Why does CAS report cos(45)=sqrt(2)^-1 instead of sqrt(2)/2. angle mode is degrees and software is 7820.
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06-30-2015, 05:20 PM
Post: #2
RE: CAS cos(45)
http://www.wolframalpha.com/input/?i=cos%2845%C2%B0%29 ???


However, you should probably update your calculator.

TW

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06-30-2015, 05:38 PM
Post: #3
RE: CAS cos(45)
I would think it should avoid sqrt in the denominator and return sqrt(2)/2.
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07-02-2015, 12:58 AM
Post: #4
RE: CAS cos(45)
(06-30-2015 05:38 PM)rgallier Wrote:  I would think it should avoid sqrt in the denominator and return sqrt(2)/2.

It does, if you change the CAS "Simplify" Setting to either None or Maximum. It only returns 1/sqrt(2) when Simplify is set to Minimum, which unfortunately is the default setting. (FWIW, I keep mine on "None" at all times, and press the simplify button when the mood strikes).

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