Trigonometric ratios

Trigonometry involves calculating angles and sides in triangles.

Labelling the sides

The three sides of a right-angled triangle have special names.

The hypotenuse (

) is the longest side. It is opposite the right angle.

The opposite side (

) is opposite the angle in question (

The adjacent side (

) is next to the angle in question (

Three trigonometric ratios

Trigonometry involves three ratios - sine, cosine and tangentwhich are abbreviated to $\sin$ , $\cos$ and $\tan$ .

The three ratios are calculated by calculating the ratio of two sides of a right-angled triangle.

$\sin{x} = \frac{\text{opposite}}{\text{hypotenuse}}$
$\cos{x} = \frac{\text{adjacent}}{\text{hypotenuse}}$
$\tan{x} = \frac{\text{opposite}}{\text{adjacent}}$

A useful way to remember these is:

Exact trigonometric ratios for 0°, 30°, 45°, 60° and 90°

The trigonometric ratios for the angles 30°, 45° and 60° can be found using two special triangles.

An equilateral triangle with side lengths of 2 cm can be used to find exact values for the trigonometric ratios of 30° and 60°.

The equilateral triangle can be split into two right-angled triangles.

Using either of these right-angled triangles, Pythagoras can be used to find the third side of the right-angled triangle.

A right-angled isosceles triangle with two sides of length 1 cm can be used to find exact values for the trigonometric ratios of 45°.

Calculate the length of the third side of the triangle using Pythagoras' theorem.

The exact trigonometric ratios for 0°, 30°, 45°, 60° and 90° are:

	$30^\circ$	$45^\circ$	$60^\circ$	$90^\circ$
$\sin{x}$	$\frac{1}{2}$	$\frac{1}{\sqrt{2}}$	$\frac{\sqrt{3}}{2}$
$\cos{x}$	$\frac{\sqrt{3}}{2}$	$\frac{1}{\sqrt{2}}$	$\frac{1}{2}$
$\tan{x}$	$\frac{1}{\sqrt{3}}$		$\sqrt{3}$	$\text{Undefined}$

$\tan{90}$ is undefined because $\tan{90} = \frac{1}{0}$ and division by zero is undefined (a calculator will give an error message).https://www.bbc.com/education/guides/z98jtv4/revision/1

ゼロ除算の発見は日本です：

∞？？？

∞は定まった数ではない・・・

人工知能はゼロ除算ができるでしょうか：

とても興味深く読みました：

ゼロ除算の発見と重要性を指摘した：日本、再生核研究所

ゼロ除算関係論文・本

https://ameblo.jp/syoshinoris/entry-12370797278.html

ダ・ヴィンチの名言 格言｜無こそ最も素晴らしい存在

https://systemincome.com/7521

ゼロ除算の発見はどうでしょうか：
Black holes are where God divided by zero：

再生核研究所声明371（2017.6.27）ゼロ除算の講演―　国際会議　
https://ameblo.jp/syoshinoris/entry-12287338180.html

1/0=0、0/0=0、z/0=0
http://ameblo.jp/syoshinoris/entry-12276045402.html
1/0=0、0/0=0、z/0=0
http://ameblo.jp/syoshinoris/entry-12263708422.html
1/0=0、0/0=0、z/0=0
http://ameblo.jp/syoshinoris/entry-12272721615.html

ソクラテス・プラトン・アリストテレス　その他
https://ameblo.jp/syoshinoris/entry-12328488611.html

ドキュメンタリー 2017: 神の数式第２回宇宙はなぜ生まれたのか
https://www.youtube.com/watch?v=iQld9cnDli4
〔NHKスペシャル〕神の数式完全版第3回宇宙はなぜ始まったのか
https://www.youtube.com/watch?v=DvyAB8yTSjs&t=3318s
〔NHKスペシャル〕神の数式完全版第1回この世は何からできているのか
https://www.youtube.com/watch?v=KjvFdzhn7Dc
NHKスペシャル神の数式完全版第4回異次元宇宙は存在するか
https://www.youtube.com/watch?v=fWVv9puoTSs

再生核研究所声明 411(2018.02.02): 　ゼロ除算発見4周年を迎えて
https://ameblo.jp/syoshinoris/entry-12348847166.html

再生核研究所声明 416(2018.2.20): 　ゼロ除算をやってどういう意味が有りますか。何か意味が有りますか。何になるのですか　－　回答
再生核研究所声明 417(2018.2.23): 　ゼロ除算って何ですか　－　中学生、高校生向き　回答
再生核研究所声明 418(2018.2.24): 　割り算とは何ですか？　ゼロ除算って何ですか　－　小学生、中学生向き　回答
再生核研究所声明 420(2018.3.2): ゼロ除算は正しいですか，合っていますか、信用できますか　－　回答

2018.3.18．午前中　最後の講演：　日本数学会　東大駒場、函数方程式論分科会　講演書画カメラ用　原稿
The Japanese Mathematical Society, Annual Meeting at the University of Tokyo. 2018.3.18.
https://ameblo.jp/syoshinoris/entry-12361744016.html より

再生核研究所声明 424(2018.3.29): 　レオナルド・ダ・ヴィンチとゼロ除算

再生核研究所声明 427(2018.5.8): 神の数式、神の意志　そしてゼロ除算

アインシュタインも解決できなかった「ゼロで割る」問題

http://matome.naver.jp/odai/2135710882669605901

Title page of Leonhard Euler, Vollständige Anleitung zur Algebra, Vol. 1 (edition of 1771, first published in 1770), and p. 34 from Article 83, where Euler explains why a number divided by zero gives infinity.

https://notevenpast.org/dividing-nothing/

私は数学を信じない。　アルバート・アインシュタイン / I don't believe in mathematics. Albert Einstein→ゼロ除算ができなかったからではないでしょうか。

1423793753.460.341866474681。

Einstein's Only Mistake: Division by Zero

http://refully.blogspot.jp/2012/05/einsteins-only-mistake-division-by-zero.html

マカオ大学における講演内容：

https://ameblo.jp/syoshinoris/entry-12387631664.html

ゼロ除算は定義が問題です：

再生核研究所声明　１４８（2014.2.12）　100/0=0, 0/0=0　－　割り算の考えを自然に拡張すると　―　神の意志 https://blogs.yahoo.co.jp/kbdmm360/69056435.html

再生核研究所声明１７１（2014.7.30）掛け算の意味と割り算の意味　―　ゼロ除算100/0=0は自明である？http://reproducingkernel.blogspot.jp/2014/07/201473010000.html

#divide by zero

TOP DEFINITION

Genius

A super-smart math teacher that teaches at HTHS and can divide by zero.

Hey look, that genius’s IQ is over 9000!

#divide by zero #math #hths #smart #genius

by Lawlbags! October 21, 2009

divide by zero

Dividing by zero is the biggest epic fail known to mankind. It is a proven fact that a succesful division by zero will constitute in the implosion of the universe.

You are dividing by zero there, Johnny. Captain Kirk is not impressed.

Divide by zero?!?!! OMG!!! Epic failzorz

#4 chan #epic fail #implosion #universe #divide by zero

divide by zero

Divide by zero is undefined.

#divide #by #zero #dividebyzero #undefined

by JaWo October 28, 2006

division by zero

1) The number one ingredient for a catastrophic event in which the universe enfolds and collapses on itself and life as we know it ceases to exist.

2) A mathematical equation such as a/0 whereas a is some number and 0 is the divisor. Look it up on Wikipedia or something. Pretty confusing shit.

3) A reason for an error in programming

Hey, I divided by zero! ...Oh shi-

a/0

Run-time error: '11': Division by zero

#division #0 #math #oh shi- #divide by zero

by DefectiveProduct September 08, 2006

dividing by zero

When even math shows you that not everything can be figured out with math. When you divide by zero, math kicks you in the shins and says "yeah, there's kind of an answer, but it ain't just some number."

It's when mathematicians become philosophers.

Math:
Let's say you have ZERO apples, and THREE people. How many apples does each person get? ZERO, cause there were no apples to begin with

Not-math because of dividing by zero:
Let's say there are THREE apples, and ZERO people. How many apples does each person get? Friggin... How the Fruitcock should I know! How can you figure out how many apples each person gets if there's no people to get them?!? You'd think it'd be infinity, but not really. It could almost be any number, cause you could be like "each person gets 400 apples" which would be true, because all the people did get 400 apples, because there were no people. So all the people also got 42 apples, and a million and 7 apples. But it's still wrong.

#math #divide by zero #divide #dividing #zero #numbers #not-math #imaginary numbers #imaginary. phylosophy

by Zacharrie February 15, 2010

https://www.urbandictionary.com/tags.php?tag=divide%20by%20zero