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2. 2 cos ( 2x + 5/6π ) = √3
cos ( 2x + 5/6π ) = 1/2 √3
cos ( 2x + 5/6π ) = cos 30 derajat = cos 1/6π...
x1 = 2x + 5/6π = 1/6π + k. 2π
k = 0
2x = 1/6π - 5/6π
x = -1/3π ( tidak memenuhi ).
k= 1
2x = 1/6π + 2π - 5/6π
2x = 1/6π + 12/6π - 5/6π
2x = 4/3π
x = 2/3π
x2 = 2x + 5/6π = -1/6 + k. 2π
k = 0
2x = -1/6 - 5/6π
x = -1/2π ( tidak memenuhi ).
k = 1
2x = -1/6 + 2π - 5/6π
2x = π
x = 1/2π
@@@@@@@@ jadi hp = ( 2/3π, 1/2π )......
$#$# jangan lupa, jadikn yang trbaik yooo.....................