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*cari titik potong -> untuk batas bawah dan batas atas
y = -x² + 4
-2x + 4 = -x² + 4
x² - 2x = 0
x (x - 2) jadi dari x= 0 sampai x=2
π
= π
= π
= π[]₀²
= π() - (0)
= π SV
mm... ada yg salah ga?