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Little problem with CAS


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#1 Hlib2

Hlib2

    Casio Freak

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  • Gender:Male
  • Location:Ukraine
  • Interests:industrial electronics,
    graphing calculators

  • Calculators:
    fx-9860GII-2,
    cfx-9850GC+,
    fx-9750G+, fx-9750GII,
    fx-991DE_X, graph100+,
    ti-83+_SE, ti-84+, ti-85,
    ti-voyage200.

Posted 25 October 2021 - 02:59 PM

I easily converted the expression manually:
cos(3×X)+cos(X)=2×cos(2×X)×cos(X).
But I couldn`t do it either in afx-2.0+/graph100+ or in ti-v200. I may have forgotten some of the CAS features of these calculators. I would be grateful for a hint on how to do this in CASIO.




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