# Derivative #tan(sqrt(x))# using first principle method?

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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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- Solve: dy/dx+ y = xy^3 .??
- What is the equation of the line tangent to # f(x)=2xcos3x# at # x=pi/3#?
- For #f(x) =4x^3+12x^2+9x+7#, what is the equation of the line tangent to #x =-3/2#?

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