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Step-by-step explanation:
no. 1)
fx=3+4
f(x+h)=h+h^2=x
f(x+h)=3(x+h)+4=3x+3h+4
f(x-h)/h =3x+3h+4(3x+4)/h
=3x+3h+4(3x+4)/h
=3h/h
=3
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