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f'(x)= (2+0).(2x-4+0)
= 2.(2x-4)
= 4x-8
2. f(x)=(1/4x"+3)
f'(x)= (1/4).2.x +3
= 1/2x+3
3. f(x)= x-2/x" +3
f'(x)= x -(-2xpangkat -dua) + 3
= x +2x pangkat -2+3