Trigonometric EquationMedium
Question
The solution set of (5 + 4 cos θ) (2 cos θ + 1) = 0 in the interval [0, 2π] is :
Options
A.
B.
C.
D.
Solution
(5 + 4cos θ) (2 cos θ + 1) = 0
cos θ = -
, cos θ - 
⇒ θ = 
cos θ = -
, cos θ - ⇒ θ = Create a free account to view solution
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