![](https://thestemscholars.com/wp-content/uploads/2019/08/envelope.gif)
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Prerequisites:
1) differentiating multivariable entities
2) good understanding of curves and how their equations represent them
The envelope can be used to solve different types of questions. Suppose you want to find the area by the family of curves, x-axis and y-axis, the envelope equation can be found and then integrated using appropriate boundary conditions.
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