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comment How to find point on sphere from pitch and heading
Multiply each component by the radius $r$
May
24
comment The lines $x+2y+3=0$ , $x+2y-7=0$ and $2x-y+4=0$ are sides of a square. Equation of the remaining side is?
Same method/answer as me, and I answered a few seconds before you. Alas!
May
24
answered The lines $x+2y+3=0$ , $x+2y-7=0$ and $2x-y+4=0$ are sides of a square. Equation of the remaining side is?
May
21
revised Perpendicular vectors in 3d
added 134 characters in body
May
21
comment Perpendicular vectors in 3d
Or you can pick from $a=\hat{x}$, $a=\hat{y}$ or $a=\hat{z}$ depending which one gives the lowest $a \cdot u$.
May
21
comment Perpendicular vectors in 3d
You can pick a random $a$ and then subtract the parallel projection to $u$. Like $$ a \leftarrow a - u \frac{a \cdot u}{u \cdot u} $$
May
21
answered Perpendicular vectors in 3d
May
20
comment Freefall with terminal velocity - expressions for velocity and position
Drag acts against gravity. Positive is down, and drag is acting upwards (thankfully for parachuters).
May
20
comment Characteristic Polynomial of $4×4$ matrix
Changed the letter x with symbol × in the title.
May
20
revised Characteristic Polynomial of $4×4$ matrix
edited title
May
20
comment Freefall with terminal velocity - expressions for velocity and position
You can easily show that $\mathrm{d}t=\dfrac{1}{\frac{\mathrm{d}v}{\mathrm{d}t}}\mathrm{d}v=\frac{1}{\dot‌​{v}}\mathrm{d}v$ and $\mathrm{d}x=v\mathrm{d}t=\frac{v}{\dot{v}}\mathrm{d}v$
May
20
answered Freefall with terminal velocity - expressions for velocity and position
May
19
revised A line through the point P(8, -7) is a tangent to the circle C at the point T. Find the length of PT.
added 10 characters in body
May
19
comment A line through the point P(8, -7) is a tangent to the circle C at the point T. Find the length of PT.
This is the same as my response, only you gave out the numerical answer instead of only the methodology.
May
19
answered A line through the point P(8, -7) is a tangent to the circle C at the point T. Find the length of PT.
May
18
comment When will $\operatorname{det}\left(A\cdot A^{\top}\right)=0$?
Yep. tex.stackexchange.com/questions/30619/…
May
18
comment When will $\operatorname{det}\left(A\cdot A^{\top}\right)=0$?
I changed ^{T} to ^{\top}. I think it looks better.
May
18
revised When will $\operatorname{det}\left(A\cdot A^{\top}\right)=0$?
Changed $T$ to $\top$
May
10
comment showing condition number of a matrix is the square root of $A^\top A$
I changed the transpose from ^T to ^\top.
May
10
revised showing condition number of a matrix is the square root of $A^\top A$
edited title, changed transpose from T to \top