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26 December, 03:59

Trigonometry

Trigonometric Equations

0 ≤ x ≤ 2 π, solve the equation 4 sec x + 8=0

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Answers (2)
  1. 26 December, 04:05
    0
    x = 2π/3, 4π/3

    Step-by-step explanation:

    4secx = - 8

    secx = - 2

    cosx = - ½

    basic angle = π/3

    x = π - π/3, π + π/3

    x = 2π/3, 4π/3
  2. 26 December, 04:16
    0
    Step-by-step explanation:

    4 sec x=-8

    secx=-2

    cos x=-1/2=-cos π/3=cos (π-π/3), cos (π+π/3)

    =cos (2π/3), cos (4π/3)

    x=2π/3,4π/3
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