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Problem

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9 Nov 2021

Given information

Note that given a function .

Step-by-step explanation

Step 1.
Concept used:
 
The one-sided limits of the derivative approach opposite in a vertical cusp, with positive infinity on one side and negative infinity on the other. The one-sided limits of the derivative of a vertical tangent are identical to the same sign of infinity.
 
The derivative at the relevant point is undefined in both the cusp and the vertical tangent.

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