Mathematics · Trigonometric Equations
The solution set of the trigonometric equation 8 cos2θ + 14 cosθ + 5 = 0 in the interval [0, 2π] is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1{2π3, 5π3}
- 2{2π3, 4π3}✓
- 3{π3, 4π3}
- 4{π3, 2π3}
Correct answer
{2π3, 4π3}
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