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P=a²-½(3600-120a+a²)
P=½a²-1800+60a
P=½a²+60a-1800
P=a^2 - 0,5(a^2 - 120a + 3600)
P=0,5*a^2 +60a-1800
P=a(1/2 a +60)-1800