Question

cos 7 theta sin 3 theta​

Answer 1

Answer:

• the answer is 1/2(cos10θ+ cos 4θ)

Step-by-step explanation:

as we know that

cosαsinβ=1/2[cos(α+β) + cos(α-β)]

1. so according to this equation is
2. given α=7θ,β=3θ;
3. cos7θsin3θ=1/2[cos(7θ+3θ)+cos(7θ-3θ)]
4. cos7θsin3θ=1/2[cos10θ+cos4θ] is the answer.

Answer 2

Answer:

Step-by-step explanation: