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Mar
25
answered Calculate Tangent Points to Circle
Mar
21
comment Solving a differential equation confusion
Just to clarify $P^2 = \left(\frac{{\rm d}y}{{\rm d}x}\right)^2$ and not $P^2 = \frac{{\rm d}^2y}{{\rm d}x^2}$. Is $P$ and operator or a variable?
Mar
20
comment How did he get this outcome?
If you plug in the given $\boldsymbol{x}$ to $\mathrm{A} \boldsymbol{x}-\boldsymbol{b}$ you will get all zeros except the last one, which is 1. That tells me something is wrong.
Mar
20
comment How did he get this outcome?
It is because it is the correct answer for least squares. How do you know the given answer is "correct"? I think there is row or two missing from $\mathrm{A}$ or there is a mistake in $\boldsymbol{b}$.
Mar
20
answered How did he get this outcome?
Mar
19
revised Maximization of angle between two 3D vectors
added 150 characters in body
Mar
19
answered Maximization of angle between two 3D vectors
Mar
19
awarded  Civic Duty
Mar
19
comment Finding the $n^{th}$ derivative of $x^r$
Heh. Not proof, but confirmation.
Mar
18
answered Finding the $n^{th}$ derivative of $x^r$
Mar
14
answered How to solve $\cos(x)\cos(2x)\cos(4x)=1/8$
Mar
14
comment simple math matrix transformation
@delita you cannot go from a vector to a matrix of this form with linear algebra. You will have to construct the matrix by appending its columns.
Mar
14
comment simple math matrix transformation
note that $B = A^\top$ and $A = \begin{bmatrix}v&v&v\end{bmatrix}$ where $v$ is the given vector.
Mar
14
answered Find the circumference of a circle, given a chord and the length of the rest of the circle
Mar
14
comment Find the circumference of a circle, given a chord and the length of the rest of the circle
Yes a sketch would be helpful I think.
Mar
9
answered What's wrong with my solution?
Mar
9
revised What's wrong with my solution?
removed the [tag:calculus-variations]
Mar
1
answered $-3 = (3\theta+\sin\theta) \cos(\theta)$ How do I solve this trig equation?
Mar
1
comment $-3 = (3\theta+\sin\theta) \cos(\theta)$ How do I solve this trig equation?
There is no analytical solution. Only option is to use numerical methods. Either single point iteration or newtons should suffice.
Feb
29
comment Can't get right solution for this polar problem…
Who knows really???