Introduction to Calculus: What is Derivative and Integral

This is a topic ties every things about (functions and graphs) together.

We're mainly concerned with two parts:

1. Derivative (Differentiation)
2. Integrals (Integration)

Derivative is equal to rate of change. Most of the time we will us $dy \over dx$ to present how one variable changes with another. The derivative is the gradient of a tangent line

But from the beginning we are going to talk about where do you want the derivative, the other way to say is I will give you a point and then tell me what's the derivative or gradient for that point.

From the beginning here is the concepts you need for calculus.

1. "what is the derivative at x=n" you can under stand as "what is the gradient when x=n"
2. "What is the Integral at x=a to x=b" you can under stand as "what is the area between the function and the x axis from x=a to x=b".

Conclusion (from the beginning )

derivative = gradient of a tangent = rate of change Integral = area under the function.

examples

1. what is the derivative at x=5
2. what is the derivative at x=9
3. what is the derivative at x=2