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sin²a + sin²acos²a + cos⁴a = 1
L = sin²a + cos²a (sin²a + cos²a) = sin²a + cos²a * 1 = sin²a + cos²a = 1 = P
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sin²a + sin²acos²a + cos⁴a = 1
L = sin²a + cos²a (sin²a + cos²a) = sin²a + cos²a * 1 = sin²a + cos²a = 1 = P