Hi guys! I have so many old music because old music have an interest meanings for me, let's see the 100 best songs in 20th century:

100. Michael Jackson- Earth Song
99. My Bloody Valentine- Only Shallow
98. James Brown- I Got You (I Feel Good)
97. Ben E. King- Stand By Me
96. Chuck Berry- Jhonny B. Goode
95. Deep Purple- Smoke on the Water
94. U2- Where the Streets Have No Name
93. The Animals- House of the Rising Sun
92. Thin Lizzy- The Boys Are Back in the Town
91. Stevie B- Waiting For Your Love
90. The Beatles- Strawberry Fields Forever
89. James Taylor- Fire and Rain
88. Stevie Wonder- Superstition
87. Pink Floyd- Comfortably Numb
86. Aerosmith- Dream on
85. Sex Pistol- Anarchy in the U.K
84. Bob Daylan- The Times They are Changing
83. Black Flag- Rise Above
82. Green Day- Waiting
81. Air Supply- Making Love Out of Nothing at All
80. Bryan Adams- Heaven
79. John Denver- Rocky Mountain High
78. The Who- Baba O'Rilley
77. Queen- We Will Rock You
76. Alphaville- Sounds Like Melody
75. Peter Cetera- Glory of Love
74. Blink 182- I Miss You

Alphaville formed in early 1982, when Marian Gold and Bernhard Lloyd met at the music project Nelson Community. Many months later, Frank Mertens joined the project. Together the three wrote Forever Young and recorded their first demo of the same name. In 1984, the newly-renamed Alphaville released their debut single, "Big in Japan", which Gold wrote in 1979 after hearing the music of Holly Johnson's band Big in Japan. In autumn 1984, they released their debut album, Forever Young, produced by Colin Pearson, Wolfgang Loos and Andreas Budde. Despite its success, Frank Mertens left the band that year and was replaced in January 1985 by Ricky Echolette (born Wolfgang Neuhaus, in Cologne on 7 August 1960), who was credited on the Afternoons in Utopia album.

Hi guys! I have a formula in mathematics, but I know it is very popular.

Here the formula:     b² = a² + c² – 2ac cos B

We know this formula as Cosine Theorem, but how the formula came?

Here I show the proving:

Let’s see to the picture,

By Pytagoras Theorem, we got:

h² = b² – (c – y)²  …………..(i)    also we got,           h² = a² – y² ……………………..(ii)

Then we got,    cos B = y/b à y = b cos B …………………………………………….(iii)

Because (i) and (ii) are same, so we got:

h² = h² …………………………………………………..(same)

b² – (c – y)²  = a² – y² …………………………………..(substitute from h²)

b² – (c² – 2cy + y²) = a² – y² ……………………………(after simplify (c – y)² )

b² – c² + 2cy - y² = a² – y² ………………………………(open the brackets)

b² = a² + c² – 2cy ………………………………………..(after add c² and y², reduce 2cy in all parts)

b² = a² + c² – 2ac cos B ....................................................(substitute y from (iii) )

You may prove for a and c as subject of the formula..

Thank you, and good luck! :)

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This game classified as a strategy game. This name is ANCIENT EMPIRES 2.
This game was launched by Macrospace. Ltd. This game will allow you to think about strategy to win!
Short stories, King Galamar and King Valadorn are two powerful brothers. They have a mission to protect 3  
Crystal of Wisdom. Unfortunately, two evil there are Saeth and Demon Lord want to use the Crystals to make a powerful weapon to rule the world that is Heavens Fury.
In this game you can play campaign mode, that are 8 mission for you to keep Crystals safely. You will allow to control your kingdom and two brothers, Galamar and Valadorn or you can play Skirmishes mode.

Yo guys! Don't missed it out!
This is link for you to download to your phone.
Download Ancient Empires

Hi!. I'm very interest to old music. I have so many links that can allow you to download! Enjoy ya :)

Air Supply - All Out of Love
Air Supply - Lonely in the Night
Air Supply - I Can't Wait Forever
Aerosmith - I Don't Wanna Miss a Thing

 Let’s we talk about Calculus especially about Differential. Start from easy, let’s see this function:

1.       F(x) = 4x⁴ + 5x³ + 6x + 7

This function after differential becomes:

dx/dy F(x) = dx/dy 4x⁴ + 5x³ + 6x + 7

                      = 16x³ + 15x² + 6

What about if F(x) = 2^x, it’s very difficult for us. So we need to us natural logarithm (ln), let’s see how it’s work!

F(x) = 2^x, suppose that F(x) = y so that,

y = 2^x

ln y = ln 2^x

ln y = x ln 2

dy/dx ln y = dy/dx x ln 2

1/y = dy/dx ln 2

è dx/dy = y ln 2

            = 2^x (ln 2)

So, we conclude that if F(x) = a^x, the differential will be a^x (ln a)

Thank you everybody  J