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Die geskiedenis van trigonometrie

Werk twee-twee of in groepe en ondersoek die geskiedenis van trigonometrie. Beskryf die verskillende stappe van die ontwikkeling en hoe verskillende kulture trigonometire gebruik om hulle lewens te verbeter.

Die werk van die volgende mense of kulture kan ondersoek word:

  1. Kulture
    1. Antieke Egiptenare
    2. Mesopotamië
    3. Antieke Indiërs van die Indusvallei
  2. Mense
    1. Lagadha (ongeveer 1350-1200 vC)
    2. Hipparchus (ongeveer 150 vC)
    3. Ptolemy (ongeveer 100)
    4. Aryabhata (ongeveer 499)
    5. Omar Khayyam (1048-1131)
    6. Bhaskara (ongeveer 1150)
    7. Nasir al-Din (13de eeu)
    8. al-Kashi en Ulugh Beg (14de eeu)
    9. Bartholemaeus Pitiscus (1595)

Grafieke van trigonometriese funksies

Funksies van die vorm y = sin ( k θ )

In die vergelyking, y = sin ( k θ ) , is k 'n konstante en het verskillende effekte op die grafiek van die funksie. Die algemene vorm van so 'n grafiek word gegee in [link] vir die funksie f ( θ ) = sin ( 2 θ ) .

Grafiek van f ( θ ) = sin ( 2 θ ) (vastelyn) en die grafiek van g ( θ ) = sin ( θ ) (stippellyn).

Funksies van die vorm y = sin ( k θ )

Op dieselfde assestelsel, plot die volgende grafieke:

  1. a ( θ ) = sin 0 , 5 θ
  2. b ( θ ) = sin 1 θ
  3. c ( θ ) = sin 1 , 5 θ
  4. d ( θ ) = sin 2 θ
  5. e ( θ ) = sin 2 , 5 θ

Gebruik jou resultate om die effek van k af te lei.

Jy behoort te vind dat die waarde van k die periode of frekwensie affekteer. Let op dat in die geval van die sinus grafiek, die periode (lengte van een golf) gegee word deur 360 k .

Die verskillende eienskappe word opgesom in [link] .

Tabel wat die algemene vorm en posisie van grafieke van funksies in die vorm y = sin ( k x ) opsom. Die kurwe van y = sin ( x ) word voorgestel deur die stippel lyn.
k > 0 k < 0

Definisie versameling en waarde versameling

Vir f ( θ ) = sin ( k θ ) is die definisieversameling { θ : θ R } , omdat daar geen waarde van θ R is waarvoor f ( θ ) ongedefinieerd is nie.

Die waardeversameling van f ( θ ) = sin ( k θ ) is { f ( θ ) : f ( θ ) [ - 1 , 1 ] } .

Afsnitte

Vir funksies van die vorm y = sin ( k θ ) , word die nodige inligting om die afsnit met betrekking tot die y as gegee.

Daar is baie x -afsnitte.

Die y -afsnit word bereken deur θ = 0 te stel:

y = sin ( k θ ) y afsnit = sin ( 0 ) = 0

Funksies van die vorm y = cos ( k θ )

In die vergelyking y = cos ( k θ ) , is k 'n konstante en het verskeie effekte op die grafiek van die funksies. Die algemene vorm van die grafiek van hierdie soort funksies word gegee in [link] vir die funksie f ( θ ) = cos ( 2 θ ) .

Grafiek van f ( θ ) = cos ( 2 θ ) (vastelyn) en die grafiek van g ( θ ) = c o s ( θ ) (stippellyn).

Funksies van die vorm y = cos ( k θ )

Op dieselfde assestelsel, plot die volgende grafieke:

  1. a ( θ ) = cos 0 , 5 θ
  2. b ( θ ) = cos 1 θ
  3. c ( θ ) = cos 1 , 5 θ
  4. d ( θ ) = cos 2 θ
  5. e ( θ ) = cos 2 , 5 θ

Gebruik jou resultate om die effek van k af te lei.

Jy behoort te vind dat die waarde van k affekteer die periode of frekwensie van die grafiek. Die periode van die cosinus grafiek word gegee deur 360 k .

Die verskillende eienskappe word opgesom in [link] .

Tabel wat die algemene vorms en posisies van grafieke van funksie in die vorm y = cos ( k x ) opsom. Die kurwe van y = cos ( x ) is geplot met die stippel lyn.
k > 0 k < 0

Definisie versameling en waarde versameling

Vir f ( θ ) = cos ( k θ ) , is die definisie versameling { θ : θ R } , omdat daar geen waarde is van θ R waarvoor f ( θ ) ongedefinieerd is nie.

Die waarde versameling van f ( θ ) = cos ( k θ ) is { f ( θ ) : f ( θ ) [ - 1 , 1 ] } .

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
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Can you compute that for me. Ty
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what is inorganic
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Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
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can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
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"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
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progressive wave
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Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
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Source:  OpenStax, Siyavula textbooks: wiskunde (graad 11). OpenStax CNX. Sep 20, 2011 Download for free at http://cnx.org/content/col11339/1.4
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