A, b , dan c adalah sudut sudut segitiga, maka cos 1/2(a+b) ?
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Diketahui:
segitiga -> a,b,c
Ditanyakan:
cos(1/2)(a+b)
Jawab:
cos(1/2)(a+b)
= cos(1/2)(180°-c)
= cos(90°-(c/2))
= sin(c/2)
Mapel: Matematika
Kelas: 10
Materi: Trigonometri