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p =a- 2x
l = b - 2x
L = pl
L = (a-2x)(b-2x)
L(x) = ab - x( 2a - 2b) + 4x²
L'(x) = 0
8x -(2a -2b) = 0
x = 1/8( 2a - 2b)
x = 1/4 a - 1/4 b
L(x) = ab - 1/2(a+b)(a-b) + 1/4 (a-b)²