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)]

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11 -1> 1 -1+ a

-12 > a