Mathematics, 16.03.2020 22:57 Tonyswife15

How do i prove
sin^2 x cos^2 y - cos^2 x sin^2 y ≡ sin^2 x - sin^2 y

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How do i prove
sin^2 x cos^2 y - cos^2 x sin^2 y ≡ sin^2 x - sin^2 y...