(sin x + cos x) (sin x + cos x) = 2 sin^2 x - 1. bantu dong kakak kakak
Matematika
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Pertanyaan
(sin x + cos x) (sin x + cos x) = 2 sin^2 x - 1.
bantu dong kakak kakak
bantu dong kakak kakak
1 Jawaban
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1. Jawaban Anonyme
(a + b)² = a² + 2ab + b²
(sin x + cos x)(sin x + cos x)
= (sin x + cos x)²
= sin² x + cos² x + 2 sin x cos x
= 1 + sin 2x
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