just fill in the few boxes (serious answers only or i’ll report) also if you zoom in on the picture, it’ll become clear

See explanation

Step-by-step explanation:

sin(α + β) = sin α cos β + sin β cos α

sin(α - β) = sin α cos β - sin β cos α

[ sin(α + β) + sin(α - β)] = [sin α cos β + sin β cos α + sin α cos β - sin β cos α]

                               = [2 sinα cos β]

                               = sin α cos β = [ sin(α + β) + sin(α - β)]

i think it is 18

step-by-step explanation:

answer: 0.26

i used the calculator on google