Cos^4x - sin ^4x/sin^2x
Matematika
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Pertanyaan
Cos^4x - sin ^4x/sin^2x
1 Jawaban
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1. Jawaban Robinn
cos^4x - sin^4x / sin²x
= (cos²x - sin²x)(cos²x + sin²x) / sin²x
= (cos²x - sin²x) / sin²x
= cos2x / sin²x