Question

If cos6θ = a cos6θ + b cos4θsin2θ + c cos2θsin4θ + d sin6θ,
find a, b, c, d.​

Answer 1

Answer:

sin2θ+cos2θ)3=1

sin6θ+cos6θ+3sin2θcos2θ(sin2θ+cos2θ)=1

sin6θ+cos6θ+3sin2θcos2θ(1)=1

Hence answer is C