cos^theta- sin^thea=1-2sin^theta
Matematika
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Pertanyaan
cos^theta- sin^thea=1-2sin^theta
1 Jawaban
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1. Jawaban dnnyz07
misal theta : a
cos² a - sin² a = 1- 2sin²a
ingat:
sin²a + cos²a = 1
cos²a = 1- sin²a
1-sin²a - sin²a = 1-2sin²a
1-2sin²a = 1-2sin²a
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