(sinα+cosα)²=1+2sinαcosα
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sin²α + cos²α = 1
L = (sinα + cosα)² = sin²α + 2sinαcosα + cos²α = 1 + 2sinαcosα
L = P
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sin²α + cos²α = 1
L = (sinα + cosα)² = sin²α + 2sinαcosα + cos²α = 1 + 2sinαcosα
L = P