- $\rhd$ Local linearity (9:37) Estimate $\sqrt{4.36}$.
- $\rhd$ Linear approximation of a rational function (7:10) Find a linear expression that approximates $\dfrac{y}{x-1}$ around $x=-1$.
- $\rhd$ Comparing $\Delta y$ and $dy$ (4:07) Let $y=2x^2$.
- Find the change in $y$, $\Delta y$, when $x=2$ and $\Delta x=0.3$.
- Find differential $dy$ when $x=2$ and $dx=0.3$.
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