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  • 0 posts edited
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  • 41 votes cast
Sep
13
comment Software to easily draw 3d plots from functions
it's funny, but as far as I remember, I actually resorted to GeoGebra in that situation, it is now installed on my desktop
Feb
4
comment Does a complex number multiplication have a geometric representation and why?
okay, thank you, so I've understood that the statement that a complex number can be represented by a vector is incorrect. Please correct me, if I'm wrong
Aug
12
comment How to find a basis of an image of a linear transformation?
@BenWest thanks to you and André Nicolas, now it seems clear to me.
Aug
12
comment How to find a basis of an image of a linear transformation?
could you please provide an example?
Jul
30
comment reduction of $6xy + 8 y^2 -12x-26y + 11 = 0$ to canonical one of a second-order curve
thank you, but the main confusing thing was why I was not able to get the correct coordinates of transformed system's origin.
Jul
29
comment reduction of $6xy + 8 y^2 -12x-26y + 11 = 0$ to canonical one of a second-order curve
sorry, but I missed the point. Could you please detail how can I get the right answer (that the given equation is an equation of a hyperbola, which is rotated and shifted to the point (-1,2))?
Jul
29
comment reduction of $6xy + 8 y^2 -12x-26y + 11 = 0$ to canonical one of a second-order curve
thank you, I did not know about this way. I'll try it asap.
Jul
27
comment Could anybody provide a more detailed explanation of a tangent equation in its general form?
thank you, it just did not come to my mind that ' symbol has a meaning of a derivative. And in the textbook this word was not mentioned
Jul
27
comment how to prove $ax + by = cx + dy \implies a = c, b = d$?
how you can be sure that if $x \neq 0, y \neq 0 \implies a - c = b - d$ ? Could you please detail this?
Jul
27
comment how to prove $ax + by = cx + dy \implies a = c, b = d$?
and what if both x and y are 1?
Jul
27
comment how to prove $ax + by = cx + dy \implies a = c, b = d$?
I think they are both supposed to be 1, cause I saw this in the proving of coordinate transformation formula. x and y are the orts of the x and y axes.
Jul
26
comment How to find an equation of a plane perpendicular to two other planes and passing through a point
possible duplicate of Find a plane that passes through a point and is perpendicular to 2 planes
Jul
26
comment Plane parallel to two lines and goes through a point?
please, accept the answer
Jul
26
comment Determining the equation of a plane that contains one point and one line.
@ZolTunKul so did you checked this? Two months have passed.
May
8
comment Can somebody provide an explanation to the formula of a one elementary integral?
@Artem, thank you very much!
Mar
30
comment Please, I need a more detailed explanation of the particular solution of the problem with vectors
@DonAntonio, thank you for the suggestion, I am from the former USSR and in our school this way of a solution of quadratic equations isn't taught. I never heard about it. Thanks.
Feb
28
comment Please, help me to find where is a mistake in the solutions of the equation.
@André Nicolas, I'm not sure, but as I understood this is true if we certainly know that this infinite geometric series converges. But how can I assume that from the condition? Because $1+sin(2x)$ is the exact value not greater than $2$ and not infinity?
Feb
28
comment Please, help me to find where is a mistake in the solutions of the equation.
@André Nicolas would you mind if I ask you to elaborate your comment with possible example? I did not understand.
Feb
28
comment Please, help me to find where is a mistake in the solutions of the equation.
$tan(x)=0$ is the subset of the $x_1=\pi k ,\space k \in \mathbb{Z}$, as I understood, isn't it?
Feb
2
comment Missing and parasite roots in the trigonometric equation.
yes, it works. Huge thanks to both of you.