refer to the attachment
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Answer:
2cos
3
θ−cosθ
sinθ−2sin
3
θ
=
cosθ(2cos
2
θ−1)
sinθ(1−2sin
2
θ)
=
cosθ.cos2θ
sinθ.cosθ
=
cosθ
sinθ
=tanθ.
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