(1+sin A) (Tan A- sec A)
Matematika
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Pertanyaan
(1+sin A) (Tan A- sec A)
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1. Jawaban Anonyme
jawab
(1 - sin A) (tan a - sec A) =
= (1 - sin A) (sin A/cos A - 1/cos A)
= (1 - sin A) (sin A - 1) /cos A
= - (sin A +1)(sin A - 1) /cos A
= - (sin² A - 1) / cos A
= (1 - sin² A)/ cos A
= cos² A/ cos A
= cos A