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Pomax
2020-10-18 14:27:57 -07:00
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docs/chapters/pointvectors/content.en-GB.md
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@@ -32,7 +32,7 @@ The tangent is very useful for moving along a line, but what if we want to move
\begin{array}{l}
normal_x(t) = \hat{x}(t) \cdot \cos{\frac{\pi}{2}} - \hat{y}(t) \cdot \sin{\frac{\pi}{2}} = - \hat{y}(t) \\
\\
normal_y(t) = \underset{quarter\ circle\ rotation} {\underbrace{ \hat{x}(t) \cdot \sin{\frac{\pi}{2}} + \hat{y}(t) \cdot \cos{\frac{\pi}{2}} }} = \hat{x}(t)
normal_y(t) = \underset{quarter~circle~rotation} {\underbrace{ \hat{x}(t) \cdot \sin{\frac{\pi}{2}} + \hat{y}(t) \cdot \cos{\frac{\pi}{2}} }} = \hat{x}(t)
\end{array}
\]