Buktikan identitas trigonometri(1+sin x)(1-sin x)=cos x
Matematika
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Pertanyaan
Buktikan identitas trigonometri(1+sin x)(1-sin x)=cos x
2 Jawaban
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1. Jawaban Anonyme
(1 +sin x)(1 - sin x) = cos x
(1 + sin x)(1 -sin x)=
= 1 - sin x + sin x - sin² x
= 1 - sin² x
= cos² x + sin² x - sin²x
= cos² x -
2. Jawaban Anonyme
Identitas Trigonometri
(a + b)(a - b) = a² - b²
(1 + sin x)(1 - sin x)
= 1² - sin² x
= cos² x
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