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t = 4.000/p²
L(t)= p² + 4 pt = p²+ 4 p ( 4.000/p²)
L(p) = p² + 16.000/p
L ' (p) = 2p - 32.000/p³ = 0
2p = 32.000/p³
2p^4 = 32.000
p^4 = 16.000
p = 11,25
L(p) = 252,98