(sin A)² + (cosA)² = 1
Matematika
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Pertanyaan
(sin A)² + (cosA)² = 1
1 Jawaban
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1. Jawaban Robinn
→ A diganti x
(sinx)² + (cosx)² = 1
sin²x + cos²x = 1
1 - cos²x + cos²x = 1
1 = 1
atau :
sin²x + cos²x = 1
sin²x + 1 - sin²x = 1
sin²x - sin²x + 1 = 1
1 = 1