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Verified answer
Jawab2 cos (x - 45) = √2
cos (x - 45) = 1/2 √2 = cos 45
x - 45 = 45 + k. 360 atau x - 45 = - 45 + k. 360
x = 90 + k. 360 atau x = k. 360
k= 0,1,2,3...
k = 0, x = 90 atau x = 0
k = 1 , x = 450 atau x = 360
x pada interval 0 ≤ x ≤ 90
x = (0, 90)