Diketahui:
p - q = cos A
√2pq = sin A → 2pq = sin² A
p² + q² = ?
(p - q)² = cos² A
p² - 2pq + q² = cos² A
p² - sin² A + q² = cos² A
p² + q² = cos² A + sin² A
Karena cos² A + sin² A = 1 (identitas trigonometri), maka
p² + q² = 1
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Diketahui:
p - q = cos A
√2pq = sin A → 2pq = sin² A
p² + q² = ?
p - q = cos A
(p - q)² = cos² A
p² - 2pq + q² = cos² A
p² - sin² A + q² = cos² A
p² + q² = cos² A + sin² A
Karena cos² A + sin² A = 1 (identitas trigonometri), maka
p² + q² = 1