921 reputation
218
bio website http://---
location Latvia
age 27
visits member for 1 year, 10 months
seen Dec 2 at 20:09

Sentient being on faulty hardware. Loves math, programming and few other beings.


Sep
30
awarded  Explainer
Aug
15
revised 'Canonical' form of permutations, product of transpositions
I added definition/description; deleted 128 characters in body
Aug
15
asked 'Canonical' form of permutations, product of transpositions
May
1
answered Use logarithmic differentiation to find the derivative of $y = (1 +\frac1x)^{2x}$
Mar
30
comment Let $0\,^{\circ}\mathrm{} < A < 45\,^{\circ}\mathrm{}$ . If $420(\tan A + \cot A) = 841$ then find the value of $(116 \cos A − 58 \sin A)$.
@labbhattacharjee Ouch, yes. :)
Mar
30
comment Let $0\,^{\circ}\mathrm{} < A < 45\,^{\circ}\mathrm{}$ . If $420(\tan A + \cot A) = 841$ then find the value of $(116 \cos A − 58 \sin A)$.
$\tan A+\frac1{\tan A}=\frac{841}{420} \iff420\tan^2A-841\tan A+240=0$
Mar
30
comment Adding two vectors such that the resulting vector is perpendicular to a third vector
$(b+tc)\cdot a=0\\ (1+2t, 4+t, -4-3t)\cdot(-3, 3, 1)=0\\ (1+2t)\cdot(-3)+(4+t)\cdot 3+(-4-3t)\cdot 1=0\\ t=\frac{5}{6}$
Mar
30
revised What is wrong in my “solution”?(task about multiple root,parameter)
Formatting fixes
Mar
30
suggested approved edit on What is wrong in my “solution”?(task about multiple root,parameter)
Feb
7
awarded  Yearling
Oct
7
comment Approximation of $26!$
26!/2^88 ~ 4/3. It's really approximate and is, imho, simply coincidence.
Sep
16
revised How much weight is on each person in a human pyramid?
edited body
Sep
15
revised How much weight is on each person in a human pyramid?
I simplified solution a little bit.
Sep
15
comment How much weight is on each person in a human pyramid?
I believe there's no closed-form expression.
Sep
15
revised How much weight is on each person in a human pyramid?
Fixed minor mistake
Sep
15
revised How much weight is on each person in a human pyramid?
Wrote binomials in the way that's more popular
Sep
15
revised How much weight is on each person in a human pyramid?
Second part added
Sep
15
revised How much weight is on each person in a human pyramid?
Added first part of explanation
Sep
14
revised How much weight is on each person in a human pyramid?
added 20 characters in body
Sep
14
answered How much weight is on each person in a human pyramid?