Kakak yang bisa tolong bantu ya..... Terimakasih Kakak

8. tan A =-3/4. tan B = 4/5
dit= sin A+sin B?
jwab
tan A = -3/4 (y/x) r=√x^2 + y^2
sin A = y/r =√4^2+(-3)^2
= -3/5 =√16+9 = √25 =5
tan B = 4/5 (y/x)
sin B = y/r
=4/5
sinA + sin B = -3/4 + 4/5
= -15/20 + 16/20 = 1/20

10) sin^2 30 + sin^2 40 + sin^2 50 + sin^2 60
      = (sin^2 30 + sin^2 60) + (sin^2 40 + sin^2 50)
      = 1 + 1
      = 2