# What is the equation of the line normal to # f(x)=xtanx# at # x=pi/2#?

There is no such thing.

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The equation of the line normal to f(x) = xtanx at x = pi/2 is y = -x.

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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.

- How do you find f'(x) using the definition of a derivative for #f(x)= 2x^2-x #?
- What is the slope of #f(x)=(x+2)/e^(x-x^2) # at #x=-1#?
- How do you find the equation of the tangent line and normal line to the curve #y = (5+6x)^2# at the point (-4,361)?
- What is the equation of the line that is normal to #f(x)=-2x^3+4x-2 # at # x=-2 #?
- What is the equation of the line tangent to #f(x)= x^5-e^x # at #x=2#?

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