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= (cos²α + sin²α)(cos²α - sin²α) = 1 * (cos²α - sin²α) =(cos²α - sin²α) = P
(cos²α + sin²α) = 1 (jedynka trygonometryczna !)
GOTOWE!!!
L= cos⁴α - sin⁴α= (cos²α - sin²α)( cos²α + sin²α)= (cos²α - sin²α) ·1= =cos²α - sin²α
P= cos²α - sin²α
L=P
sin²α + cos²α =1- jedynka trygonometryczna
Równość jest prawdziwa