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cos x + sin x = k cos (x-α)
a= 1 ,b = 1 --> k = √(a²+b²) = √2
tan α = b/a = 1 ,= tan 45°, krn b > 0, dan a> 0 , α di kuadran I
α = 45°
y = cos x + sin x = √2 cos (x - 45)
nilai y maksimum = √2 untuk cos(x-45) = 1
nilai y minimum = -√2 untuk cos (x-45) = -1