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= sin A² - sin A.cos A - sin A.cos A + cos²A + 2. sin A. cos A
= sin A² + cos²A - 2. sin A . cos A + 2. sin A. cos A
= sin A² + cos²A
= 1 (terbukti)
Ket : sin²A + cos²A = 1 (identitas trigonometri)