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Verified answer
Jawabcos x + sin x = 1 → a cos x + b sin x = c
a= 1
b = 1
c = 1
k = √(a²+b²)= √2
a= tan⁻¹(b/a) = 45
cos x + sin x = 1
√2 cos (x + 45) = 1
cos (x + 45) = 1/√2 = 1/2 √2 = cos 45
x+ 45 = 45+ k. 360 atau x + 45 = - 45 + k. 360
x = k 360 atau x = -90 + k. 360
k = 0,1,2,...
k= 0 , x = 0, x = - 90
k = 1 , x = 360 , x = 270
pada interval 0 ≤ x ≤ 360
x = 0, 270, 360