Sprawdź tożsamość trygonometryczną
(7sinα + 3cosα)^2 + (3 sinα - 7cosα)^2 = 40
(7sinα + 3cosα)^2 + (3 sinα - 7cosα)^2 =49sin²α+42sinαcosα+9cos²α+9sin²α-42sinαcosα+49cos²α=49(sin²α+cos²α)+9(sin²α+c0s²α)=49+9=58
L≠P
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(7sinα + 3cosα)^2 + (3 sinα - 7cosα)^2 =49sin²α+42sinαcosα+9cos²α+9sin²α-42sinαcosα+49cos²α=49(sin²α+cos²α)+9(sin²α+c0s²α)=49+9=58
L≠P