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Coba kuadratkan kedua ruas.
(7/5)² = (sin x - cos x)²
49/25 = sin²x - 2sin(x)cos(x) + cos²x
49/25 = (sin²x+cos²x) - 2sin(x)cos(x)
Mengingat:
sin²x + cos²x = 1
2sin(x)cos(x) = sin(2x)
Maka:
49/25 = 1 - sin(2x)
sin(2x) = 1 - 49/25
sin(2x) = (25-49)/25
sin(2x) = -24/25