Sinusoidal functions(TRIGONOMETRY)

Trig functions like sine and cosine have periodic graphs which we called Sinusoidal Graph, or Sine…

Logarithm

Euler's number ｅ

The Euler's number ｅ actually came from the Compound Interest, for calculating the…

Circle

“The circle is arguably the most fundamental shape in our universe.” — Sal Khan

Arc length

Conic Sections

It’s something related to the previous topic Cross sections. It is a section (or a slice) through a Cone.

Equations of Circle

Definition of circle: The set of all points on a plane that are a fixed distance from a center.

Radical Equation

Means an equation or an expression that has a square root, cube root, etc.
The symbol is √.

Extraneous solutions of radical equations

Series

Arithmetic Series

Arithmetic Series is the SUM of Arithmetic Sequence. Like the sum of sequence 1, 3, 5, 7.

Function graphs

Mainly on different graphs of common functions and their transformation images.

π (pi) Where does it come from

π = Circumference / Diameter

That’s why, when you do dπ or 2πr, you will get a π, it's progress of getting it back.

𝑒 as a limit

When you do this formula:

Whatever the n is, no matter how large n goes, 
the value of the formula will NOT go insanely big, it will only get closer and closer to the number 2.7....

So we call the number it is approaching as 𝑒. And express the idea as below: