252 reputation
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age 19
visits member for 2 years, 10 months
seen Apr 18 at 9:11

Oct
17
awarded  Popular Question
Jul
2
awarded  Curious
Apr
11
awarded  Popular Question
Sep
30
awarded  Popular Question
Dec
17
awarded  Yearling
Jun
23
awarded  Autobiographer
Jun
17
accepted Linear transformation for projection of a point on a line
Jun
17
comment Linear transformation for projection of a point on a line
So, I was close! Thank you very much for the last missing bits. It seems obvious now.
Jun
17
revised Linear transformation for projection of a point on a line
added 4 characters in body
Jun
17
asked Linear transformation for projection of a point on a line
Jun
14
accepted Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$
Jun
14
revised Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$
edited title
Jun
14
comment Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$
The first tip was what I needed. Do you write the answer or do I do?
Jun
14
asked Prove: if $A(x)$ is divisible by $(x-a)^m$, its derivative is divisible by $(x - a)^{m-1}$
Jun
9
answered Plotting a quadratic equation in the $\,xy\,$- plane
Apr
26
awarded  Critic
Feb
5
comment Trigonometric equality $\cos x + \cos 3x - 1 - \cos 2x = 0$
I've not succeeded in finding a general formula. I've written down all formula's for $\cos(2x)$ to $\cos(5x)$ but I can only find one similarity in them: \begin{align} \cos(n \cdot x) &= a_1 \cos^nx - a_2 \cos^{n-2}x + a_3 \cos^{n-4}x - … \end{align} But I can't find $a_1$, $a_2$, etc.
Feb
5
comment Trigonometric equality $\cos x + \cos 3x - 1 - \cos 2x = 0$
\begin{alignX} \end{alignX} (without the X's) will do the trick, no dollar signs needed
Jan
31
revised Trigonometric equality $\cos x + \cos 3x - 1 - \cos 2x = 0$
added 676 characters in body
Jan
31
comment Trigonometric equality $\cos x + \cos 3x - 1 - \cos 2x = 0$
I'm studying for a test for tomorrow, so I don't have the time to do it now. But this intrigues me and I'll definitely will try it tomorrow. I'll come back to your comments.