maka cos x=...? Di bantu ya kak

Kelas 10 Matematika
Bab Trigonometri Dasar

1 1/2 π < x < 2π → kuadran IV

cos x . tan x + 1/2 √3 = 0
cos x . sin x/cos x = -1/2 √3
sin x = -1/2 √3
x = 300°

cos x = cos 300° = 1/2

 1/2gan

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