TS EAMCET · Maths · Trigonometric Ratios & Identities
If , then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Given that x+1x=2cosθ square on both the sides x+1x+2=4cos2θ x+1x=22cos2θ-1=2cos2θ cube on both the sides x+1x3=8cos32θ x3+1x3+3x+1x=8cos32θ x3+1x3=8cos32θ-2cos2θ ⇒x3+1x3=2cos2θ4cos22θ-1…
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