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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???