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yesy7

  • 11 months ago

Find all solutions in the interval [0, 2π). 7 tan^3x - 21 tan x = 0

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  1. RolyPoly
    • 11 months ago
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    Let u = tanx Then, the equation becomes \[7u^3-21u=0\]Factorize the left, you'll get\[7u(u^2-3) = 0\]Can you solve u from here?

  2. yesy7
    • 11 months ago
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    I just did some of the work on scratch paper from the help of the lessons. Would you mind double checking my work?

  3. RolyPoly
    • 11 months ago
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    I don't mind. Please post it :)

  4. yesy7
    • 11 months ago
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    I got 0, pi/3, 2pi/3, pi, 4pi/3, 5pi/3?

  5. RolyPoly
    • 11 months ago
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    Yup :)

  6. yesy7
    • 11 months ago
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    Thank you!

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