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# OnlineMSchool - Feedback

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-adolfo teco-
i love you're page,but can you add some curves of second order..thanks.
-Christian Schou-
thanks
-sahar-
goog very helpful
-Kabutsu-
Many thanks for the point to a line distance calculator!
-Yolanda Vasquez-
You have realy help me
-jeve-
As long as you do the math for the angle between planes, you might as well show the equation for the line, or a point on the line.
-Shelley-
Thank-you. I teach calculus and just found your site. It is super time consuming so that I don't have to manually check 25 different solutions!
-James-
Sites awesome great help thanks
-hfjuuu-
3+5+8
-P. Mathonet-
Hello,

I am currently teaching geometry at the University of Liège, Belgium. I found your site when I was looking for a standard notation for the angle of two vectors. Your formula for the angle is correct. However, maybe you should mention that it holds for non-zero vectors and adapt the calculation accordingly. For the vectors (0,0,0) and (1,2,3), it returns the value 0, although the angle is not defined.

Best regards,

P. Mathonet
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 © 2011-2017 Dovzhyk MykhailoWelcome to OnlineMSchool. This web site owner is mathematician Dovzhyk Mykhailo. I designed this web site and wrote all the mathematical theory, online exercises, formulas and calculators. If you want to contact me, probably have some question write me email on suppotr@onlinemschool.com SERVICES  Online calculators  Online exercises  Library  Formulas  Percentage Calculator OnlineMSchool  Feedback  support@onlinemschool.com