Buktikan identitas trigonometri(1+sin x)(1-sin x)=cos x
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Pertanyaan
Buktikan identitas trigonometri(1+sin x)(1-sin x)=cos x
1 Jawaban
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1. Jawaban reginamutiara
Buktikan identitas trigonometri(1+sin x)(1-sin x)=cos x
(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