misalkan a=x+30° soal berubah
sin (2a) - cos (a) = 0
2sin(a)cos(a) - cos(a) =0
(2sin(a) -1)cos(a) =0
sin(a) = 1/2 atau cos (a) = 0
a = 30° atau a = 150° atau a = 90°
x = 0° atau x = 120° atau a = 60°
jawab D.
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misalkan a=x+30° soal berubah
sin (2a) - cos (a) = 0
2sin(a)cos(a) - cos(a) =0
(2sin(a) -1)cos(a) =0
sin(a) = 1/2 atau cos (a) = 0
a = 30° atau a = 150° atau a = 90°
x = 0° atau x = 120° atau a = 60°
jawab D.