Question

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Answer 1

sin^4 α - cos^4 α - sin^2 α + cos^2 α = sin^2 α * (sin^2 α - 1) - cos^2 α * (cos^2α - 1) = sin^2 α * (sin^2 α - sin^2 α - cos^2 α) - cos^2 α * (cos^2α - sin^2 α - cos^2 α) = -sin^2 α * cos^2 α + sin^2 α * cos^2 α = 0

Ответ: 0.