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k = √(1+1)
= √2
tan α = 1/1
α = 45°
y = 1 + √2 cos (2x - 45°)
Nilai y maksimum jika nilai cos (2x - 45°) maksimum
nilai cos (2x - 45°) maksimum = 1
jadi:
y maks = 1 + √2 .1
= 1 + √2