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? asked in Science & MathematicsMathematics · 9 years ago

Need help on precalc trigonometry --> Cos(x)=1/3?

Trigonometry precalc help

And the domain is 0 degrees <_ x <_ 90 degrees

1 Answer

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  • secretply
    Lv 4
    9 years ago
    Favorite Answer

    Solve for x, take cos inverse to each side: x = cos^-1 (1/3)

    Using a calculator, this comes out to 70.5288 degrees and 289.4712 degrees but 289.4712 is not within the domain so that is not an answer.

    70.5288 degrees is the only answer.

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