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Question
Choose the correct alternative:
cos 2θ cos 2ϕ+ sin2 (θ – ϕ) – sin2 (θ + ϕ) is equal to
Options
sin 2 (θ + Φ)
cos 2 (8 + Φ)
sin 2 (θ – Φ)
cos 2(θ – Φ)
Solution
cos 2 (8 + Φ)
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