TS EAMCET · Maths · Trigonometric Equations
If then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
Given, θ∈-π,π 6cos2θ+2cos2θ2+2sin2θ=0 ⇒61-2sin2θ+2cos2θ2+2sin2θ=0 ⇒6-10sin2θ+2cos2θ2=0 ⇒6-101-cos2θ+1+cosθ=0 ⇒10cos2θ+cosθ-3=0 ⇒10cos2θ-5cosθ+6cosθ-3=0…
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