cos^4 x (1 + tan^4 x) = 1-2 sin² x cos² x
Matematika
Noti
Pertanyaan
cos^4 x (1 + tan^4 x) = 1-2 sin² x cos² x
1 Jawaban
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1. Jawaban ramdanibela
cos^4 x(1+tan^4 x)=cos^4 x(1+sin^4 x/cos^4x) = cos^4 x + sin^4 x = (cos^2 x + sin^2 x)^2 - 2sin^2 x.cos^2 x = 1 - 2sin^2 x.cos^ 2x (terbukti)