1) - 4Sin²α + 5 - 4Cos²α = - 4(Sin²α + Cos²α) + 5 = - 4 * 1 + 5 = 1
2) Sin(π/2 - x) - Sin(π/2 + x) = Cosx - Cosx = 0
3) Cos⁴x + Sin²xCos²x = Cos²x(Cos²x + Sin²x) = Cos²x * 1 = Cos²x
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1) - 4Sin²α + 5 - 4Cos²α = - 4(Sin²α + Cos²α) + 5 = - 4 * 1 + 5 = 1
2) Sin(π/2 - x) - Sin(π/2 + x) = Cosx - Cosx = 0
3) Cos⁴x + Sin²xCos²x = Cos²x(Cos²x + Sin²x) = Cos²x * 1 = Cos²x