If the identity cos 4 θ = a cos 4 θ + b cos 2 θ + c holds for some a , b , c ∈ ℚ …

1. $\left(\frac{1}{8},\frac{3}{8},\frac{1}{2}\right)$
2. $\left(\frac{1}{8},\frac{1}{2},\frac{3}{8}\right)$
3. $\left(\frac{1}{2},\frac{1}{8},\frac{3}{8}\right)$
4. $\left(\frac{1}{2},\frac{3}{8},\frac{1}{8}\right)$

Solution

Asked in: AP EAMCET 2022 (04 Jul Shift 1)

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