Question

Tolong kak nomor 35

Butuh pertolongan bangets.

Answer 1

Sin α = 4/5
cos α = 3/5

cos β = 8/10
sin β = 6/10

sin (α + β)

= sin α. cos β + cos α. sin β

= 4/5 . 8/10 + 3/5 . 6/10

= 32/50 + 18/50

= 50/50

= 1