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(sin x + cos x)² = sin² x + sin x cos x + sin x cos x + cox² x
=> sin² x + 2 sin x cos x + cos² x
=> sin² x + cos² x + 2 sin x cos x
=> 1 + 2 sin x cos x
(sin x + cos x)² = 1 + 2 sin x cos x
sin x + cos x =
terbukti...ok?