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a=2x-2
a√2=(2x-2)√2=2x√2-2√2
Obw = 2*(2x-2)+2x√2-2√2 = 4x-4+2x√2-2√2
P = ½a*h= ½(2x-2)*(2x-2)= ½(4x²-8x+4)= 2x²-4x+2