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Please can you help me with this ,how can i write this one?enter image description here

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2 Answers 2

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try the below code

$$\left.\frac{dy}{dx}\right|_{x=-1}=-5$$
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Your post has the vertical line extended well below the baseline. If this is important to you, try this code:

\[\frac{dy}{dx}\,{\rule[-3.5ex]{.1ex}{7.0ex}\,}_{x=-1}=-5\]

This allows you manual control of the vertical line. In the code above, the -3.5 controls the depth of the line, the .1 controls the thickness of the line and the 7.0 controls the total height of the line.

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