Question

Choose the correct alternative:
cos 2θ cos 2ϕ+ sin² (θ – ϕ) – sin² (θ + ϕ) is equal to

विकल्प

• sin 2 (θ + Φ)

• cos 2 (8 + Φ)

• sin 2 (θ – Φ)

• cos 2(θ – Φ)

Answer 1

cos 2 (8 + Φ)