Quadratic Formula & Trigonometric Equations...2

Discussion in 'Geometry and Trigonometry' started by nycmathguy, Dec 20, 2021.

  1. nycmathguy

    nycmathguy

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    Section 5.3

    Screenshot_20211219-105410_Samsung Notes.jpg

    IMG_20211219_124439.jpg

    IMG_20211219_124450.jpg

    Why is arccos[(4 + sqrt{32})/8] undefined?

    IMG_20211219_124501.jpg
     
    nycmathguy, Dec 20, 2021
    #1
  2. nycmathguy

    MathLover1

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    solutions are correct

    now answering: Why is arccos[(4 + sqrt{32})/8] undefined? -> because solution is an imaginary number

    Real domain for arccos (x ) is -1<=x<= 1
    so, cos^-1((4+ sqrt(32))/8) has No Solution for x in R, for that reason is undefined for x in R
     
    MathLover1, Dec 20, 2021
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    nycmathguy likes this.
  3. nycmathguy

    nycmathguy

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    Is there a math course that mixes trigonometry with imaginary numbers?
     
    nycmathguy, Dec 20, 2021
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