cos 130+cos 50 = tolong yaa plisssss... pake jalan

cos (180-50) + cos 50
= -cos 50 + cos 50
= 0

Cos130⁰=-(cos180⁰-ψ⁰)cos130⁰=-(cos180⁰-130⁰)cos130⁰=-cos50⁰-cos50⁰+cos50⁰=0

*semoga membantu :)