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Higher vertical separation line in Latex

Posted by Derek Jing on 3:24 PM in
There are maybe some other better ways to do this, but I only can figure out following method:

\[f'(y)=\dfrac{\partial f(x)}{\partial x}\Bigl\lvert_x=y\]
\[\Bigl\lvert\frac{a}{b}\Bigr\rvert\]


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