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jika a-b = sinA (kuadratkan ruas kanan dan kiri)
(a-b)^2 = sin^2 A
a^2 + b^2 - 2ab = sin^2A (2ab = cos^2A)
a^2 + b^2 - cos^2 A = sin^2A
a^2 + b^2 = sin^2 A+ cos^2 A (ingat rumus trigonometri, sin^2A + cos^2 A = 1 )
a^2 + b^2 = 1