Question

please give me answer with photo​

Answer 1

Answer:

This is your answer

Step-by-step explanation:

《mark me brainlist and liked my answer and fallow me》

Answer 2

Step-by-step explanation:

cos(a +b)=0

cos( a + b) = cos90 ( cos0=0)

a+b= 90

⇒a =90−b

sin(a - b) =sin(90−2b)=cos2b ( Sin(90−θ)= cosθ)

so sin (a - b) can be reduced to cos2b

I HOPE THAT HELPS , PLEASE MARK IT AS BRAINLIEST