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Verified answer
IDentiTas TriGonoMEtri(cos x + sin x)² + (cos x - sin x)²
= (cos² x + sin² x + 2 sin x cos x) + (cos² x + sin² x - 2 sin x cos x)
= 1 + 0 + 1
= 2
TerBukTi
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x = teta
(a ± b)² = a² + b² ± 2ab
sin² x + cos² x = 1