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√2pq = Sin A
2pq = Sin² A
p - q = Cos A
(p - q)² = Cos² A
p² + q² - 2pq = Cos² A
p² + q² = Cos² A + 2pq
p² + q² = Cos² A + Sin² A
p² + q² = 1 (aturan phytagoras trigonometri Cos² A + Sin² A = 1)