Question

answer this question

Answer 1

Answer:

Option(B)

Step-by-step explanation:

(5)

Given: cos(α + β) = 0.

cos(α + β) = cos 90°

α + β = 90

α = 90 - β.

Now,

sin(α - β)

= sin(90 - β - β)

= sin(90 - 2β)

= cos 2β.

Hope it helps!

Answer 2

Step-by-step explanation:

cos(α + β) = 0.

cos(α + β) = cos 90°

α + β = 90

α = 90 - β.

sin(α - β)

sin(90 - β - β)

sin(90 - 2β)

cos 2β.