Evaluate sin(arccos(1/4))

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Evaluate sin(arccos(1/4))

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  1. The Math Sorcerer
  2. trigonometry
  3. inverse trigonometric functions
  4. inverse trig function expressions
  5. evaluate inverse trig functions
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Комментарии
Автор

these videos are excellent. a simple math problem solved with clear explanations. please upload more

SaeedNeamati
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Thank you so much!
I'm not good at math, nor do I like it so much, but I find this so beautiful!

Ghassen
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The entire problem reduces to: find the Sine of some angle (a) ; Sin(a)=?
If we know that the cosine of that same angle (a) equals 1/4; Cos(a)=1/4.

So:
Cos(a)=1/4
Sin(a)=?
Sin(a)=+-Sqrt( ( 1^2 ) - ( 1/4 )^2 )
= +- Sqrt(15)/4
The problem is solved without even knowing what that angle (a) was.

** +- because there are 2 different angles with the same cosine in the trigonometric circle

fyohox
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когда настолько отчаялась, что смотришь видео на инглиш, чтобы понять наконец это

КатяКузенко
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i first heard this this in khan academy maths lecture and i realised we called it Pandit Badare Parasad Har Har Bole , which is soc cah toa . lol

MAHESH_SPEAKS
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"opposite is 4, whoops" lol so cute. thanks for this! helped a lot!

trishaconcon
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Begorrah, I can remember mnemonics Soh Cah Toa from old schooldays.

pinklady
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thts so american way wtf yall need some asian tips

batireeduigantulga