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Nov
15
comment Area under a curve using calculus
It is not the same because in ${\rm d}y + {\rm d}x{\rm d}y = {\rm d}y$ all the terms are differentials. What I meant to say maybe is ${\rm d}x{\rm d}y = 0$ compared to the magnitude of ${\rm d}x$ or ${\rm d}y$
Nov
13
answered Area under a curve using calculus
Nov
13
comment Find the center and radius of the circle whose equation is $x^ 2 + y^ 2 - 6x - 2y + 4 = 0$
For me it is the right way to do it. It works with oblique ellipses and hyperbolas also. The radius comes out as the circumscribed circle radius.
Nov
13
revised Find the center and radius of the circle whose equation is $x^ 2 + y^ 2 - 6x - 2y + 4 = 0$
added 224 characters in body
Nov
13
answered Find the center and radius of the circle whose equation is $x^ 2 + y^ 2 - 6x - 2y + 4 = 0$
Nov
10
comment Is $1010908899$ divisible by $7$ , $11$ and $13$?
If you don't need to do it by hand then factor the number using an online tool. $1010908899 = 3^2 \cdot 7 \cdot 11^2 \cdot 13 \cdot 101^2 $
Nov
10
revised Generalised formula for fitting a cubic between two points with specified slopes at each point
added 443 characters in body
Nov
10
answered Generalised formula for fitting a cubic between two points with specified slopes at each point
Nov
9
comment solution of quadratic equation n unknown
If $n=2$ the result is a curve, and if $n=3$ the result is surface. In fact the equation is one constraint in $n$ space make one of the coefficients dependent on all the others.
Nov
9
awarded  Yearling
Nov
9
comment Linear Algebra - Find the line that passes through a point and intersects two lines.
The line intersecting the two planes is parallel to the first line. In theory this procedure should work though.
Nov
9
comment How to draw an ellipse if a center and 3 arbitrary points on it are given?
Note to self. Do not use mirror points because a solution won't be found. Also sometimes the result is a hyperbola and not an ellipse.
Nov
8
revised How to draw an ellipse if a center and 3 arbitrary points on it are given?
added 812 characters in body
Nov
8
answered How to draw an ellipse if a center and 3 arbitrary points on it are given?
Nov
6
answered Compute the volume of a sphere with a cylindric hole
Nov
6
comment Compute the volume of a sphere with a cylindric hole
typo: "copmute"
Nov
6
answered Finding a point that is a certain distance away from a segment
Nov
5
answered Value of second derivative
Nov
5
comment Value of second derivative
This goes to the scientific method. You only need to find one case to disprove the thesis $f'(x)=2$. This can be done by fitting any polynomial of order 3 or higher.
Nov
5
revised How to show given two vectors $x, y$, $x^\intercal y = \|x\|\|y\|\cos(\theta)$
added 9 characters in body; edited title