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Mathematics

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Answer :

Answer:

cos 2θ + cos θ = (2cos θ - 1)(cos θ + 1)

cos 2θ - cos θ = (2cos θ + 1)(cos θ - 1)

Step-by-step explanation:

cos 2θ + cos θ = 2cos²θ - 1 + cos θ

cos 2θ + cos θ = 2cos²θ + cos θ - 1

2cos θ - 1

cos θ + 1

cos 2θ + cos θ = (2cos θ - 1)(cos θ + 1)

cos 2θ - cos θ = 2cos²θ - 1 - cos θ

cos 2θ - cos θ = 2cos²θ - cos θ - 1

2cos θ + 1

cos θ - 1

cos 2θ - cos θ = (2cos θ + 1)(cos θ - 1)

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