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a)
f'(x)=0
f'(3)=f'(6)=0
b)
f'(x)=3
f'(1)=f'(5)=3
c)
f'(x)=2*2x=4x
f'(-1)=4*(-1)= -4
f'(2)=4*2=8
d)
f'(x)=3x^2
f'(-2)=3*(-2)^2=3*4=12
f'(3)=3*3^2=3*9=27