universemaster · March 8, 2021 15:50
diff --git a/katex error on aligned b/katex error on aligned
 $$x^2 + y$$

 We write

 $$\begin{aligned}
 df &= (dx,dy) ⋅ \left( \frac{∂ f}{∂ x}, \frac{∂f}{∂y} \right) \\
 &= d 𝐬 ⋅ ∇f\,.
 \end{aligned}$$

 ---

 Consider the gradient vector.

 Use $\hat{𝐬}$ to write

 $$d 𝐬$$

 and an expression for

 $$\left| \hat{𝐬} \right| = ?\,.$$
	$$x^2 + y$$

	We write

	$$\begin{aligned}
	df &= (dx,dy) ⋅ \left( \frac{∂ f}{∂ x}, \frac{∂f}{∂y} \right) \\
	&= d 𝐬 ⋅ ∇f\,.
	\end{aligned}$$

	---

	Consider the gradient vector.

	Use $\hat{𝐬}$ to write

	$$d 𝐬$$

	and an expression for

	$$\left\| \hat{𝐬} \right\| = ?\,.$$
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