Find the derivative of 1st principle if f(X)= 5x+7/2x+3
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f'(x) = d/dx ( 5x+7/2x+3)
f'(x)= d/dx5x + d/dx 7/2x + d/dx 3
f'(x)= 5+ 7/2 d/dx 1/x +0
f'(x)= 5+7/2(-1/x²)
f'(x)= 5 - 7/2x²
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