sec 4x°-2=0 persamaan trigonometri menggunakan identitas trigonometri

sec(4x) - 2 = 0 
sec(4x) = 2 
1/cos(4x) = 2 
cos(4x) = ½ 
4x = π/3 + 2πn, 5π/3 + 2πn,
x = π/12 + 2πn, 5π/12 + 2πn
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