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f(x)==2x+1/2x^2
f'(x) = 2(2x²)-(2x+1)(4x)/ 4x⁴
f'(x) = 4x²-8x²-4x/4x⁴
f'(x) = - 4( x²+x)/4x⁴
f'(x) = -( x²+x)/x⁴