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Anne Keirstead
เข้าร่วมเมื่อ 9 พ.ค. 2012
วีดีโอ
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Great video
Dina Key
Thank-you.
That was incredible thank you so much
love you anne
Exactly what I needed, didn’t know you could put it in the regular y equals and the value would be the same!
GREAT explanation. THANK YOU!
that helped a lot thanks!
Thank You!!!!!
Great video!
I thought in cylindrical, it's rho,phi and z
How do you do it by hand?
I'm an older student (48) and, unlike my peers, I didn't take the class in high school on how to use the Ti-84. Seeing someone go through an example with the calculator is incredibly helpful, and this is one of those oddball examples that straddles a number of fences. (polar, rectangular, seeing how it works, but dragging it down to the ground to do the final calculations...) My only real request (if I was going to make one) is... how do you then drag the x,y intersections back into an answer in polar coordinates?
Thx!
I have a calculus test tomorrow and this is exactly what I needed! Love how much detail you included, thank you so much!
Thank you so much!
you're a LEGEND, keep up the amazing work.
Thank you
9:30 should be 3pi/4
Awesome explanation! Thank you!
very good video!
What is the reason physics guys use theta from z axis and make problems worsen
Beautifully explained. Thanks
Why is j negative??
This is such an amazingly detailed vid. Very helpful.
Lol you completely forgot to do it algebraically
That's the next video...
Thanks. :)
Possible translate to language Arabic now I follow you please
Isn’t arctan restricted from -pi/2 to pi/2? 9:14
Yeah I get that, but she says that (3sqrt2, 7pi/4, -7) ((roe, theta, phi)) is also an acceptable answer and I disagree because like you both said arctan range is restricted from -pi/2 to pi/2. Theta should also be in between these values. 7pi/4 is greater than pi/2.
*did not specify range at first, but I meant to say range is restricted*
@@akeirsteadmath So is -pi/4 not the correct representation because theta is from to 0 to 2pi?
@@akeirsteadmath Why not 3pi/4?
@@akeirsteadmath actually I see why it would not be 3pi/4 because that not be pointing at (3,-3) 4th quadrant in xy
She sounds like Sarah sanders 😂🤣😂🤣😂🤣😂 But her explanation is awesome
Great but it would be better if you start pronouncing phi as FAI
dont be dumb. Speak up some thing.
yo
What if your phi angle is a negative?
omg..i almost thought it was Hillary Clinton speaking 😂
tashW nice vape videos 😂
can someone tell me how we consider the range of values for theta?
... in rads
Roses are red Violets are blue I came for the thumbnail and so did you.
such a nice explanation..
Thank you:)
Soooooo helpful thank you!
really helpful! Thank you very much!!!
hey whats the value of cos45* please check the video
root 2 over 2
can anybody explain me that how phai is varying from 0 to 180 degree in spherical co ordinate system..????
Imagine r and theta (from 0 to 360) as rings. So for each phi we get a corresponding ring on the xyz plane. So now a sphere is made of rings from top to bottom right? ( i.e. phi from 0-180) If u take phi from 0-360 you are counting rings twice. (top to bottom and again bottom to top)
My calc professor showed me the other day. think of a coin. Lay it flat on the xy-plane. Rotate the coin vertically. You'll see that you only need to rotate that coin half way for it to "create" a spherical shape. you've only rotated that coin 180 degrees which is why you can consider the range from 0 to pi and you could calculate for the entire sphere. Hope that helps
Tbh i get in more than my precalc teacher, good review.
The bizarre thing is that they chose to "drop" phi from the Z axis down as opposed to making it the intuitive "up" from the "equator" (or in terms of elevation for telescopes, gunlaying, etc). I wonder why this was the case (apart from avoiding negative values).
Phi is the angle that is made from z- axis to the line of projection of point P. This angle goes from positive z axis to overlying x-y plane then to negative z axis and completes 180 degrees in its pathway.
again thanks for the hieroglyphics of cal 3
more hieroglyphics
that might get changed
I'm not sure whether my question applies here, but... Suppose you have a point (lat, lng) on a sphere of radius r, and you also have a point (lat2, lng2) directly "north" of the first point at a distance d. How do you rotate the second point on the sphere, clockwise about the first point, while keeping its distance constant?
That's what you do from the center between them.
thanks ,very helpful.
ty!!