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Karena sin^2 A + cos^2 A = 1, maka sin^2 A = 1 - cos^2 A
= (1 - cos^2 A)/(1 - cosA)
Ingat bahwa a^2 - b^2 = (a + b)(a-b)
= [(1+cos A)(1-cosA)]/(1-cos A)
= 1 + cos A
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