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sin²x = 1
sin x = 1 ∨ sin x = −1
x = 90° ∨ x = 270°
B)
cos²x = 25
cos x = 5 ∨ cos x = −5
Tidak ada nilai x ∈ R yang memenuhi
C)
2sin²x = 1
sin²x = ½
sin x = ½√2 ∨ sin x = −½√2
x = 45°, 135° ∨ x = 225°, 315°
D)
8cos²x − 4 = 0
8cos²x = 4
cos²x = ½
cos x = ½√2 ∨ cos x = −½√2
x = 45°, 315° ∨ x = 135°, 225°