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y1=y2
x^2+4x+7=13-x^2
2x^2+4x-6=0
x^2+2x-3=0
(x-1)(x+3)= 0
x=1 dan x=-3
LD: integral dr -3 sampai 1 (13-x^2)-(x^2-4x+7) dx
sisanya perhitungan biasa integral tertentu.
semoga membantuu:)