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# Definition of the Derivative & Questions

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Key points:
The derivative of at is the instantaneous rate of change of and it is denoted by .

If we let , we obtain an equivalent formula

that is at times more convenient to use in problems. A function for which the exists is called differentiable at . A function is differentiable on an interval if it is differentiable at each number in that interval.
Given we define a new function . This is the derivative function. The derivative describes how quickly is changing. Other notations for the derivative function are (where ), , .
Interact (use left and right arrow keys) with this (quicktime) animation that illustrates a function and its derivative. Before you play it try to sketch on a piece of paper.
The derivative of the derivative of is denoted by: or sometimes by .

1. Use the definition of derivative to calculate where .
2. Use the definition of derivative to calculate where .
3. Use the definition of derivative to calculate where .
4. Use the definition of derivative to find .

##### Solution Summary

The definition of the derivative is applied to four simple derivative questions. The solution is detailed and well presented.

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Below are notes my instructor gave for this assignment that are relative and important to how we do the problems there are 4 problems & a total of two pages. Thank you

Key points:
The derivative of at ...

##### Multiplying Complex Numbers

This is a short quiz to check your understanding of multiplication of complex numbers in rectangular form.

Each question is a choice-summary multiple choice question that will present you with a linear equation and then make 4 statements about that equation. You must determine which of the 4 statements are true (if any) in regards to the equation.