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untuk f(x) = 3x²
dicari f(x-2h)-f(x)/h
f(x-2h) = 3(x-2h)² = 3x²-12xh+4h²
f(x-2h)-f(x) = 3x²-12xh+4h² - 3x² = -12xh+4h²
f(x-2h)-f(x) / h = h(-12x+4h)/h
hnya di coret sisa -12x+4h