AP EAMCET · Maths · Trigonometric Equations
If the identity holds for some , then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Given cos4θ=acos4θ+bcos2θ+c L.H.S.=cos4θ=12+cos2θ22 =14+12cos2θ+14cos22θ =14+12cos2θ+1412+cos4θ2 =18cos4θ+12cos2θ+38
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