bultikan Cos4X-Sin4X=Cos2X
Matematika
Rijal023
Pertanyaan
bultikan Cos4X-Sin4X=Cos2X
1 Jawaban
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1. Jawaban DedeMaulaMcLaren21
cos⁴x - sin⁴x = cos 2x
(cos²x)² - (sin²x)² = cos 2x
(cos²x - sin²x)(cos²x + sin²x) = cos 2x
(cos²x - sin²x) 1 = cos²x - sin²x
cos²x - sin²x = cos²x - sin²x (Terbukti)