Video 1
Do You Believe.
This video tells about a son who spoke in front of many people.
He talked about the trust and confidence to the motivation for audience. With his style, this son can provide the extraordinary. Audience is very enthusiastic with his words. They give a hand to children who are able to provide extraordinary motivation.
Video 2
What you know about math?
This video tells about the person who sing a song to explain mathematics. This is very interesting to study mathematics. Plus, minus, multiplied, divided on the operation in mathematics. The calculator is a tool that helps in the treatment of mathematics. Many things about math that must be learned, such as algebra, Trigonometry, etc..
Mathematics is not just a number, also contains charts and sketched symbols. For example, sine graph, phi (п), greater than (>), and so forth. In the equation, no arithmetic operations such as addition, subtraction, multiplication and division.
Video 3
English Solving Problem
In here have some mathematics problem, for example :
1.Let the function f be defined by f(x) equals x plus one ( f(x) = x + 1)
If 2 times f(p) equals twenty ( 2f(p) = 20 ) . What is the value of f(3p) ?
The answer :
a) With the word
F(x) equals x plus one
Two times f(p) equals twenty
So f(p) equals ten
P substitute in f(x) equals x plus one
So f(p) equals p plus one
Ten equals p plus one
So p equals nine
Because p equals nine, so f(3p) equals twenty seven
f(3p) equals 3p plus one
f(3p) equals twenty seven plus one
so f(3p) equals twenty eight
b) With the numeral
f(x) = x + 1
2f(p) = 20
f(p) = 10
f(p) = p + 1
10 = p + 1
p = 9
f(3p) = 27 --> f(3p) = 3p + 1
= 27 + 1 = 28
So value of f(3p) = 28
Video 4
English Property of Logarithm
〖log〗_b x = y --> b^y = x
〖log〗_(10 )x = log x
〖log〗_c x = ln x ( natural logarithm )
Examples∶
1. log_10 100 = x
〖10〗^x = 100
x = 2
2. log_2 x = 3
2^3 = x
x = 8
3. 〖log〗_7 ( 1/49 ) = x
7^x = 1/49
7^x = 1/7^2
7^x = 7^(-2)
x = -2
Notes :
〖log〗_b ( m.N ) = 〖log〗_b (m)+〖log〗_(b) N
〖log〗_b ( m/N ) = 〖log〗_b (m)-〖log〗_(b) N
〖log〗_b ( x^(n )) = n 〖log〗_b x
Examples∶
1. 〖log〗_3 ((x^(2)( y+1 ))/z^3)=〖log〗_(3)(x^2(y + 1)) - 〖log〗_3 (z^3)
=〖log〗_3(x^2 )+〖log〗_3(y+1 )-〖log〗_(3)(z^3 )
= 2〖log〗_3 x+〖log〗_3 ( y+1 )– 3〖log〗_3 (z)
Video 5
The graph of rational function.
The fifth video tells me about the graph of rational function.
Video 6
Trigonometry
Last, this video tells about trigonometry. Trigonometry to learn about the angle on the triangle.
If has a right triangle , we can search value of sin , cos, and tan.
* Sin alpha = opposite over hypotenuse
* Cos alpha = adjust over hypotenuse
* Tan alpha = opposite over adjust
