I don't know how to take out Δx when i do the question
If , show that
(by the first principles)
Let die Meister try.
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You need to find, for the point .
Recognize the famous limits,
Since,
(limit of constant function).
Therefore,
Because, "if two limits of two functions exist at a point then the limit of their product exists at the point and is equal to the product of their limits".
Similary, since,
(limit of constant function).
Therefore,
Because, "if two limits of two functions exist at a point then the limit of their products exists at the point and is equal to the product of their limits"
Thus,
=
Because, "if the limits of two functions exist at a point then the limit of the sum of these functions exists at the point and is equal to the sum of the limits".