Sin⁴B - cos⁴B / tan²B-1 Ekuivalen dengan...
Matematika
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Pertanyaan
Sin⁴B - cos⁴B / tan²B-1
Ekuivalen dengan...
Ekuivalen dengan...
1 Jawaban
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1. Jawaban arsetpopeye
(sin^4 B - cos^4 B)/(tan^2 B - 1)
= (sin^2 B + cos^2 B)(sin^2 B - cos^2 B) / ((sin^2 B)/(cos^2 B) - 1)
= (1)(sin^2 B - cos^2 B) / (sin^2 B - cos^2 B)/(cos^2 B)
= 1 / (1/(cos^2 B)
= cos^2 B
^ = pangkat