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21h
revised What is the center of power series?
converted to LaTeX
21h
suggested approved edit on What is the center of power series?
Nov
9
revised Matrix algebra involving exponents
just adjusted matrix typography
Nov
5
revised Matrix algebra involving exponents
made example 3x3
Nov
5
answered Matrix algebra involving exponents
Nov
4
awarded  Commentator
Nov
4
comment What are the applications of Euler's formula?
A derivation of n-angle (double, triple, ...) identities is a nice quick result $(\cos x + i\sin x)^n=\cos (nx) + i\sin (nx)$; expand the left.
Nov
3
comment projectile motion (with height) complicated
@carry I can tell you the correct answer matches to the velocity of the 7.35m fall to at least 6 digits. (12.0025...)
Nov
3
comment projectile motion (with height) complicated
You can solve it with Lagrangian multipliers and minimization. If $\theta$ is the angle above the horizontal, you're minimizing $v=\frac{10.5}{t\cos (\theta )}$ with the constraints $t>0$, $0<\theta <\frac{\pi}{2}$, $4.5<0.9+10.5\tan (\theta )-\frac{9.8}{2}t^2$ (coming from just basic kinematics)
May
14
awarded  Yearling
May
14
awarded  Nice Answer
May
18
awarded  Constituent
May
17
awarded  Caucus
Nov
24
awarded  Custodian
Nov
24
reviewed Reviewed Superball total bounce distance
Nov
23
awarded  Critic
Nov
23
awarded  Student
Oct
28
revised How to calculate the integral in normal distribution?
fix typo
Oct
21
awarded  Scholar
Oct
21
comment Find the volume of a solid by integration
Thanks for your help