# For what values of x is dy/dx zero and undefined?

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#y = "x^2 - 3x + 1"/"x+2"#

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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- How do you find f'(x) using the definition of a derivative for #f(x)=5.5x^2 - x + 4.2 #?
- How do you use the definition of a derivative to find the derivative of #f(x)=x^2-3x-1#?
- What is the equation of the tangent line of # f(x)=1/x+1 # at # x=2 #?
- How do you find the equation of tangent line to the curve #y=4x^3+12x^2+9x+7# at the given point (-3/2,7)?

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