Jawaban:
Sin² A - Cos² A = 1 - Cos² A
2 Cos A - 2 Cos A = 1 - Cos ² A
1 - Cos A = 1 - Cos² A
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Jawaban:
Sin² A - Cos² A = 1 - Cos² A
2 Cos A - 2 Cos A = 1 - Cos ² A
1 - Cos A = 1 - Cos² A